Romans 10:10-13 – The Word in the Heart and Mouth

The purpose of studying Scripture verse by verse is to keep verses where God put them. We want to handle God’s Word accurately and allow doctrine to line up the way God intended. We want to do what Paul told Timothy in 2 Timothy 2:15-16,
Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.
But shun profane and vain babblings: for they will increase unto more ungodliness.

Sometimes, after examining one verse closely, we need to step back and look at the larger picture.

The context of Romans 10 is clear from the opening verse in Romans 10:1:
“My heart’s desire and prayer to God for Israel is, that they might be saved”
Paul’s speaking about unbelieving Israel.
That fact alone should warn us against assuming that Romans 10:9 is suddenly and randomly changing the context, smack in the middle of the passage, to talk about us.
Paul’s concern is for his kinsmen who’ve rejected Christ.

In Romans 10:2-3, Paul explains Israel’s problem.
They were ignorant of God’s righteousness. Instead of submitting to God’s righteousness by faith, they sought righteousness through their own works and religious efforts.
Romans 9 ended by showing that Israel stumbled because they pursued righteousness by works rather than by faith.

Then Romans 10:4 declares that “Christ is the end of the law for righteousness.”
Israel had been given the law, but righteousness no longer comes through the law. Christ is now the righteousness they need. He was who the law always pointed to.
That’s why Paul brings Christ into the discussion.

What’s interesting is that Paul doesn’t immediately launch into an explanation of the mystery of grace. Instead, beginning in Romans 10:5, he quotes Moses. Why?
Because he’s showing that even the law itself pointed toward faith.
The law taught more than commandments and works; it also taught trust in the Lord who would save His people. Nobody could even attempt to keep the law unless they had the faith to believe that it was God’s method for their salvation.

Drawing from Deuteronomy 30, Paul highlights two important themes: the heart and the mouth.
In Romans 10:10, we must remember that important word “for” again, which ties the verse right back into the previous verse. Of course, here we see that the previous verse starts with the word “that”, again, tying that verse to the previous one also. We’ve discussed the importance of keeping that flow many times. Let’s read Romans 10:10, but with the context of Romans 10:8-9 included,
But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.

Throughout Israel’s history, God taught that salvation required faith in Him. The Lord would save Israel from death, and His word needed to be in their heart and in their mouth.

Paul defines these terms for us in Romans 10:8-10.
The heart speaks of belief, and the mouth speaks of confession. This is in contrast to the works of their hands. Even under the law, faith was essential. The prophets, David, and Moses all testified to this truth.

Now Paul identifies Christ as the fulfilment of everything the law spoke of. The Lord from heaven whom Israel trusted to save them is revealed in Christ. Therefore, Paul preaches Christ crucified and risen. He’s saying, “The One Moses spoke about has come. Believe Him. Confess Him. God raised Him from the dead.”

In Romans 10:9, Paul’s showing unbelieving Israelites how they should have been saved. It’s still a history of Israel and their fall.
The “thou shalt be saved” is directed toward Israel in this context.
After spending eight chapters explaining salvation and justification, Paul’s not suddenly presenting a new salvation formula for the Body of Christ. He’s addressing Israel’s unbelief by using their own Scriptures.

This is where many people go wrong.
They treat the confession itself as the saving act. As a result, salvation is often seen as being received by a prayer, a public profession, walking an aisle, or some other religious act.
The emphasis shifts from trusting Christ to something the person did, or does. But Paul’s point is not that the words that we utter save. His point is that genuine faith in the heart produces confession from the mouth, the words we say. The issue’s always been faith in what God has done, not in what man does.

Romans 10:10 has its foundation in the Old Testament.
As we continue from our last episode, it’s important to remember where we are in Romans 10.
Paul isn’t introducing a new formula for salvation. He’s still dealing with the same issue: unbelieving Israel and their failure to obtain righteousness because they sought it through works instead of faith.

That’s why Romans 10:9-10 can’t be turned into a passage about adding a work such as a prayer, a confession, or some outward act as a condition for salvation.
The entire chapter is about how Israel missed God’s righteousness because they trusted in the works of the law rather than faith. Why then suddenly break that context and introduce some form of works that a person must perform to be saved? It makes no sense. It only makes “pretend” sense when the verse is taken completely out of the context of the whole passage. If we take Romans 10:9 and make confession a work that earns salvation, we’ve fallen into the very thing, the very error Paul’s correcting.

Again, Romans 10:10 says,
“For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.”
Notice the two themes that have been running through the context: the heart and the mouth.
Paul’s already shown from Moses that God’s concern was never merely outward performance. The issue was always what was in the heart and what came out from the mouth.

The heart represents belief. The mouth represents confession.
In Romans 10:9, the belief was that God raised Christ from the dead, and the confession was that Jesus is Lord.
What had changed was the focus of the faith: Christ. What had not changed was the necessity of faith itself.

For Israel, this was always the problem.
They had the covenants. They had the law. They had the prophets, and they had the Messiah those prophets spoke of come to them. Their problem wasn’t a lack of information. Their problem was a heart issue. They did not believe.

And that’s exactly what the New Covenant addresses.
God promised to remove the stony heart and give Israel a new heart. The issue was never simply external obedience. It was always the heart. The way into those promised blessings was faith in Christ, the risen Lord.

Paul’s emphasis on confession wasn’t something new either. It reaches back into the Law, the Prophets, and the Psalms.

Look at Philippians 2:9-11.
Paul says that because Christ humbled Himself unto death, God has highly exalted Him and given Him a name above every name. One day every knee will bow, and every tongue will confess that Jesus Christ is Lord.
That day has not arrived yet. This is future kingdom language. When Christ returns and establishes His kingdom, His authority will no longer be ignored. Every knee will bow. Every tongue will confess. Not because it’s optional, but because His rule will be openly manifested over heaven, earth, and even those under the earth.

Paul draws this language from Isaiah 45 and 47. There God declares,
“There is no God else beside me; a just God and a Saviour.”
He then calls all the ends of the earth to look unto Him and be saved. The chapter climaxes at Isaiah 45:23,
“I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.”

Notice what Isaiah says next in Isaiah 45:24:
“Surely, shall one say, In the Lord have I righteousness and strength”

There’s the issue again: righteousness is found in the Lord, not in ourselves.
That’s exactly what Paul’s teaching in Romans 10.
Israel’s righteousness was never to come from the works of the law. It was always found in the Lord.
In fact, Isaiah finishes by saying,
“In the Lord shall all the seed of Israel be justified.”

The Old Testament was never merely a system of empty religious works. Moses spoke of faith. David spoke of faith. Abraham was justified by faith. The Law, the Prophets, and the Psalms all point to the same truth. What Paul’s teaching in Romans 10 isn’t some new idea disconnected from Scripture. He’s showing that Christ and faith are the very fulfilment of what God had been declaring all along.

So when we read about believing with the heart and confessing with the mouth, we shouldn’t think Paul is introducing a work of some kind, or a formula that requires us to do or say something. He’s reminding Israel that God’s promises were always received by faith. The heart believes. The mouth confesses. And true righteousness has always been found in the Lord alone.
It’s important to see that these themes of heart and mouth didn’t begin in Romans 10. Paul’s drawing from truths that run through the entire Old Testament.

Take Psalm 119:41-42, where David prays,
“Let thy mercies come also unto me, O LORD, even thy salvation, according to thy word.”

Notice that.
Salvation comes according to God’s Word. If God’s Word brings salvation, then it must be believed. Those words must reside in the heart.

David continues by saying that because he trusts God’s Word, he now has an answer for those who reproach him.
See that? The Word’s not only in his heart; it’s also in his mouth.
In verse 43 he says,
“Take not the word of truth utterly out of my mouth.”
Later, in verse 46, he declares,
“I will speak of thy testimonies also before kings, and will not be ashamed.”

See the pattern?
David believed God’s Word in his heart and confessed God’s truth with his mouth. He wasn’t ashamed because he wasn’t speaking his own wisdom. He was speaking the words of God. And that’s exactly Paul’s point in Romans 10.

Under Moses, Israel was always required to believe what God said and confess the Lord who spoke those words. Deuteronomy 6:4 stands at the very foundation of Israel’s identity:
“Hear, O Israel: The LORD our God is one LORD”.

Everything begins there.
One Lord. One God. No rivals. No idols.
Then Moses says in Deuteronomy 6:5,
“Thou shalt love the LORD thy God with all thine heart.”
In the very next verses, Deuteronomy 6:6-10, he explains what that means.
God’s words were to be in their hearts. Why? Because they believed those words came from the one true God. Then they were to teach those words to their children and speak of them continually.
There’s the same pattern again: heart and mouth. Belief and confession.

When Solomon dedicated the temple in 2 Chronicles 6, he reinforced the same truth. He said that if Israel sinned, was judged, and then returned to God, confessing His name and turning back to Him, God would forgive them and restore them. Their problem wasn’t merely behavioural. The root cause was that they had departed from the Lord and trusted other gods.

So when Jesus appeared, He wasn’t preaching something opposite to Moses and the prophets. He was identifying Himself as the very Lord they were supposed to trust.
That’s why He said in Matthew 10:32-33:

“Whosoever therefore shall confess me before men, him will I confess also before my Father which is in heaven.”

For believing Israel, everything now centred on Christ.
The issue was no longer simply confessing the God of Israel in a general sense. The issue was whether they would recognise Jesus as that Lord.
Families would be divided over Him. Some would believe, and others would reject Him. A person might have to choose between loyalty to family and loyalty to Christ, but the question was simple: Would they confess Him?

This is exactly what Paul’s addressing in Romans 10. Israel stumbled because they rejected Christ. They would not believe in their heart that God had raised Him from the dead, nor would they confess Him as Lord.

John 9 gives us another example when Jesus healed the man born blind.
When the religious leaders questioned the man’s parents, they admitted he was their son and that he had been blind. But when asked how he received sight, they backed away. Why? John tells us plainly: they feared the Jews.
The leaders had already decided that anyone who confessed Jesus as the Christ would be put out of the synagogue.
Think about that.
Their son had been miraculously healed, yet fear kept them silent. They were more concerned about losing their place among men than acknowledging what God had done.
The evidence stood before them, but unbelief kept them from the truth.
The healed man, however, was different.
He boldly testified, “Whereas I was blind, now I see.” He wasn’t concerned with preserving his reputation. He confessed what Christ had done for him.

That’s exactly the issue Jesus addressed when He said in Matthew 10:32, “Whosoever shall confess me before men, him will I confess also before my Father which is in heaven.”
For believing Israel, confession wasn’t optional. Their faith in Christ had to be openly acknowledged.

The same problem appears again in John 12:42-43.
John says that many rulers actually believed on Jesus. Yet they would not confess Him because they feared the Pharisees.
Why?
Because they loved the praise of men more than the praise of God.
Notice the tragedy.
They believed enough to be persuaded, but not enough to stand with Him publicly. Their fear exposed where their hearts truly were.
This helps us understand Romans 10.
When Paul speaks about heart belief and mouth confession, he’s not inventing a new doctrine. He’s describing what Israel had always been required to do. The prophets spoke of it. Christ demanded it. The kingdom program required it.
Paul’s not inventing a new doctrine.
He’s showing that from Moses to David, from Solomon to Isaiah, and from Christ Himself, God’s people were always called to believe His Word in their heart and openly acknowledge Him with their mouth.
The difference in Romans 10 is that the One they must now believe and confess is Jesus Christ, the risen Lord.
Israel’s promised salvation depended upon recognising that the Lord they’d read about in the Scriptures was standing before them, crucified, risen, and exalted.
The heart still had to believe.
The mouth still had to confess. And as always, righteousness was found not in themselves, but in the Lord alone.

As we’ve been seeing throughout Romans 10, Paul’s subject hasn’t changed. He’s still explaining why Israel failed to receive the salvation and righteousness promised to them.
The issue wasn’t a lack of law, prophets, covenants, or even a lack of evidence. The issue was faith. More specifically, they wouldn’t believe in their heart and confess with their mouth what God had revealed concerning Christ and that showed they lacked the one thing they needed to walk into their salvation. Belief! Faith!

We saw last time that the themes of heart and mouth run all through the Old Testament. Moses taught it. David taught it. The prophets taught it. Jesus taught it. Now Paul is showing that Israel’s problem wasn’t ignorance alone. It was their refusal to openly identify with Christ.

Now we need to see a very important fact here.
Paul is not talking about believing the gospel that saves us today.
The ones he’s talking about weren’t trusting Christ’s finished work on the cross as revealed later through Paul. They were there when Jesus walked amongst them and taught them who He was.
The completed work on the cross had not happened yet, at that stage.
What they were being called to believe was who Jesus was. They had to acknowledge Him as the Christ, the Son of God, the promised Lord of Israel.

That’s why passages like 1 John 4 emphasise confession.
John says,
“Every spirit that confesseth that Jesus Christ is come in the flesh is of God.”
The remnant of Israel used this confession as a way to distinguish truth from error, Christ from antichrist.
John goes on to say,
“Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God.”

Again, this is kingdom doctrine that was connected to Israel’s covenant. They must recognise their Messiah, and they had every possible evidence to bring them to that recognition.

By contrast, Ephesians 1:13 tells us that in this dispensation, we’re sealed with the Holy Spirit when we hear and believe the gospel of our salvation. The emphasis is on trusting the finished work of Christ: His death for our sins and His resurrection. Nothing’s added to that work. Nothing completes it. Christ accomplished everything necessary for our salvation.

Israel’s situation was different.
Their future kingdom salvation required both heart belief and confession of Christ as their Lord and King. They failed in that, and that’s why the nation stumbled.

That’s exactly Paul’s point in Romans 10:10:
“With the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.”

Paul isn’t describing the gospel of grace for the Body of Christ.
He’s explaining Israel’s prophetic program. And to prove it, he immediately opens Scripture.
Romans 10:11 says,
“For the scripture saith, Whosoever believeth on him shall not be ashamed.”

That’s not a new revelation. That’s Isaiah speaking. It’s the same truth Paul quoted back in Romans 9 when describing Israel’s failure to recognise Christ. They stumbled over the Stone God laid in Zion because they wouldn’t believe.
So in this section, he’s not building a new doctrine.
He’s showing, from Moses, the prophets, and Christ Himself, that Israel’s salvation has always been connected to faith in the Lord’s provision. The tragedy is that when their Messiah finally came, many of them saw Him, heard Him, and even believed He was who He claimed to be, yet refused to confess Him. And that refusal revealed the very heart problem Paul’s been addressing all along.

Romans 10:11 says:

“For the scripture saith, Whosoever believeth on him shall not be ashamed.”

Most people immediately focus on the word “whosoever” in Romans 10:11, and there is certainly importance in that, but notice what Paul is emphasising from the passage he’s quoting. Nearly every word differs from Isaiah 28:16 except the central thought: belief.
That’s Paul’s point. He’s showing that Israel’s salvation always depended on faith.
If we go back to Isaiah 28, we’ll find ourselves in a chapter about Israel’s future restoration. The themes are remarkably similar to Romans 9, 10, and 11.
Isaiah 28:5 says:
“In that day shall the LORD of hosts be for a crown of glory, and for a diadem of beauty unto the residue of his people.”

The “residue” is the remnant. Not all Israel, but the believing remnant of Israel. That’s exactly what Paul’s been discussing throughout these chapters.
Then in Isaiah 28:12, the Lord offers Israel rest and refreshing. Sound familiar? Jesus said, “Come unto me… and I will give you rest.” Peter preached the same thing in Acts 3 when he spoke about the coming “times of refreshing” if Israel would repent.
But what happened?
Isaiah goes on to show that they would not hear.

The Lord came offering rest, refreshment, and salvation, yet the rulers rejected Him. They preferred their own way. They preferred the approval of men. They loved darkness rather than light.

That brings us to Isaiah 28:16:
“Behold, I lay in Zion for a foundation a stone, a tried stone, a precious corner stone.”

That stone is Christ.
Paul has already quoted this passage in Romans 9. Why? Because Israel stumbled over that Stone. The difference between those who were saved and those who stumbled wasn’t intelligence, privilege, or religious activity. It was faith.

That’s Paul’s whole argument: that the one who believes on Him will not be ashamed.
Now we come to Romans 10:12, which often gets pulled into discussions that Paul isn’t actually having.
For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.

People immediately see that as referring to the Body of Christ.
But hold on a minute. Let’s read the verse in its correct context.
Paul’s already explained what he means by “no difference” back in Romans 3. There, he proved that both Jews and Gentiles are sinners.
Romans 3:22-23 says:
“There is no difference: For all have sinned.”

There’s no difference because everyone has the same problem and needs the same solution.
Jews can’t trust the law, and Gentiles can’t trust themselves.
Everyone needs faith, just what Romans 10’s saying.

Notice the rest of Romans 10:12:
“For the same Lord over all is rich unto all that call upon him.”

There’s no difference because there’s only one Lord. Israel was taught that from the beginning in Deuteronomy 6:
“Hear, O Israel: The LORD our God is one LORD.”

That wasn’t Israel’s personal opinion; it was reality. There’s one God, one Lord, and one source of salvation for everyone.
This is why Paul could go to Gentiles and preach Christ. He wasn’t introducing a new God or creating a new religion. He was preaching the same Lord Israel’s Scriptures had always proclaimed.

People often say Christianity wouldn’t exist without Paul, and in one sense, much of the doctrine concerning the Body of Christ is revealed through Paul. But the truth that Jesus is the Son of God, that He’s the Christ, that there’s one Lord, and that people must believe God’s Word wasn’t invented by Paul. Moses taught faith. David taught faith. Isaiah taught faith. Jesus taught faith.
Paul was showing how Christ fulfilled everything they’d spoken about.

Isaiah 60 helps illustrate this beautifully.
The prophet describes Israel rising in glory, with the nations coming to her light.
There’s still a difference there between Israel and the nations, the Gentiles. Israel’s the light-bearing nation, and the Gentiles come to that light. Yet both are looking to the same Lord.
Israel cannot become that glorious city on a hill while rejecting the very One who is their Messiah. They can’t embrace the promises while stumbling over Christ. The nations can’t come to Israel’s light if Israel rejects the source of that light.

So Romans 10:11-12 isn’t teaching something entirely new.
Paul’s continuing to show from prophecy that faith has always been the issue. The Stone has been laid in Zion. The Lord has come. The offer of salvation has been made.
The question, both in Isaiah’s day and in Paul’s argument, is simple: Will they believe?
Because according to Scripture, “Whosoever believeth on him shall not be ashamed.”

As we continue through Romans 10, let’s keep reminding ourselves of Paul’s subject. He’s still talking about Israel. He’s still explaining why the nation failed to receive the promises that belonged to them. And the answer continues to be the same: they didn’t believe.

Back in Romans 9:4-5, Paul listed Israel’s advantages.
To them belonged the adoption, the glory, the covenants, the giving of the law, the service of God, and the promises. The fathers were theirs, and according to the flesh, Christ came through them. Israel had tremendous privileges.
So when Paul says in Romans 10:12 that there is “no difference between the Jew and the Greek,” he doesn’t mean there were no differences at all. Clearly there were. Israel was given covenants and promises that no other nation possessed.
The “no difference” is regarding sin and salvation. Jews were sinners just like Gentiles. Jews needed faith just like Gentiles. Jews needed God’s mercy just like Gentiles. And Jews needed the one Lord to save them just like everyone else.

Romans 10:12 also says:
“For the same Lord over all is rich unto all that call upon him.”

Rich with what? Rich with mercy. Rich with grace.
Those riches didn’t begin with Paul.
Psalm 145 celebrates the riches of God’s character long before Paul ever wrote an epistle. David says:
“I will extol thee, my God, O King; and I will bless thy name for ever and ever.”

Notice the language.
David’s blessing God’s name. He’s praising God’s name. That’s confession. His mouth is speaking because his heart believes.
David continues:
“Great is the LORD, and greatly to be praised; and his greatness is unsearchable.”

That word “unsearchable” ought to sound familiar.
Paul later speaks about the unsearchable riches of Christ. But here David’s praising the unsearchable greatness of God.
Then David says:
“One generation shall praise thy works to another, and shall declare thy mighty acts.”

Again, the pattern is the same. Heart belief produces mouth confession.
The psalm reaches a wonderful climax in Psalm 145:8-9:
The LORD is gracious, and full of compassion; slow to anger, and of great mercy.
The LORD is good to all: and his tender mercies are over all his works.

Notice, “To all”.
Not just Israel. Not just a select few. The Lord is good to all, and His mercies extend over all His works.
This is why Paul can say there’s one Lord over all. There aren’t different lords for different people. There’s one God, one Lord, one source of salvation.
Psalm 145 even says:
“The LORD is nigh unto all them that call upon him, to all that call upon him in truth.”

We can hear Romans 10 in that.
The psalm speaks about people calling upon the Lord, and the Lord hearing and saving them. The themes are exactly the same.
That’s why it’s so important to understand the difference between prophecy and mystery.
If we don’t understand what was already spoken by the prophets and what was later revealed through Paul, we’ll constantly struggle with passages like Romans 10.
Paul’s not teaching something entirely new here.
He’s showing that the Law, the Psalms, and the Prophets all taught heart faith and mouth confession.

That brings us to Romans 10:13:
“For whosoever shall call upon the name of the Lord shall be saved.”

People often pull that verse out and use it as a stand-alone gospel presentation. But Paul’s actually quoting Joel 2.
Think about that.
Joel wrote those words long before Christ’s death and resurrection. Paul’s point isn’t that Joel contained the complete gospel of grace. Rather, he’s showing that the principle of calling upon the Lord in faith was already found in the prophets.

Notice how Paul structures his argument.
In Romans 10:11, he quotes Isaiah to establish the necessity of belief:
“Whosoever believeth on him shall not be ashamed.”

That’s the heart.
Then in Romans 10:13 he quotes Joel to establish the necessity of calling upon the Lord.
That’s the mouth.

Heart and mouth. Belief and confession.

Moses taught it. David taught it. Isaiah taught it. Joel taught it. Jesus taught it.
Paul’s proving that Israel’s future salvation always involved those two elements.
This also explains why Jesus repeatedly found faith among Gentiles while encountering unbelief in Israel.
The centurion believed. The Syrophoenician woman believed. Cornelius believed. They responded to the light they were given, while many in Israel rejected their own Messiah.

Paul’s facing the very same situation.
He carries the message of Christ to Gentiles while unbelieving Israel continues to reject Him.

So the lesson of Romans 10 is not that people are saved by reciting certain words.
Many people mistakenly place their confidence in the fact that they prayed a prayer, cried out in an emotional moment, or had some experience. But the question’s not whether we said something. The question is: What are we trusting?

Paul’s concern is that we rightly understand Scripture.
His point in Romans 10 is not to give a gospel tract built around isolated prophetic verses. His point is to show that Israel missed her salvation because she would neither believe nor confess the One whom God had sent.

The same Lord who was preached by Moses, praised by David, promised by Joel, and revealed by the prophets stood before Israel in Jesus Christ. And tragically, the nation that possessed the covenants, promises, and Scriptures largely rejected Him.
Romans 9, 10, and 11 prove that Israel’s problem was not that God failed. Israel’s problem was unbelief. And Paul’s repeated appeal from the Scriptures is simple: the Lord has always responded to those who believe Him in their heart and call upon Him in truth.

When we’re in Romans 10:13, we’re in one of the most quoted verses in evangelical circles:
“For whosoever shall call upon the name of the Lord shall be saved.”

But as we’ve seen throughout this chapter, Paul isn’t pulling random verses out of thin air. He’s building a case from Israel’s Scriptures. He’s showing unbelieving Israel that everything he’s saying about faith in Christ was already written in their own Scriptures.
“Whosoever shall call upon the name of the Lord shall be saved” is quoting Joel 2:32. The question we need to ask is: What’s Joel talking about?
If we go back to Joel, we find it’s prophecy about Israel’s future kingdom and the coming Day of the Lord. Joel’s only three chapters long, but it’s packed with prophecy, judgment, restoration, and the return of the Lord. The verse Paul quotes, Joel 2:32, says:
“Whosoever shall call on the name of the LORD shall be delivered: for in mount Zion and in Jerusalem shall be deliverance”.

Notice the context?
The deliverance is in Jerusalem. The remnant that’s delivered is Israel’s remnant. This isn’t a mystery passage. This is kingdom prophecy.
Paul isn’t changing Joel’s meaning and making it refer to us today.
He’s using Joel to prove the very point he’s been making throughout Romans 10. Israel’s Scriptures taught the necessity of faith and confession. They taught heart belief and mouth confession long before Paul wrote Romans.

In Joel 2:27, God says:
“Ye shall know that I am in the midst of Israel, and that I am the LORD your God.”

When Christ came the first time, He stood in the midst of Israel.
They should have recognised Him. They should have believed Him. They should have confessed Him. Instead, the majority rejected Him.
Then Joel says God would pour out His Spirit upon all flesh.
That should sound familiar because Peter quotes that very passage in Acts 2 on the day of Pentecost.
When the Holy Spirit was poured out, and the apostles spoke with other tongues, the crowd wondered what was happening. Peter stood up and explained it in Acts 2:16:
“This is that which was spoken by the prophet Joel”.

Peter wasn’t preaching something disconnected from Joel.
He was saying Joel’s prophecy was unfolding before their eyes.
And what does Peter eventually quote? Acts 2:21,
“Whosoever shall call on the name of the Lord shall be saved”.

The same verse Paul quotes in Romans 10.
That should tell us something important.
Both Peter and Paul are appealing to a prophecy that was spoken centuries earlier. Neither is revealing a mystery in Joel 2. They’re drawing from prophecy.
This is why understanding the mystery revealed to Paul is so important.
If we don’t understand what was kept secret and what was already spoken by the prophets, we’ll constantly confuse passages.

Paul himself says in Romans 16:25 that the mystery was “kept secret since the world began.”
But nothing in Joel 2 was secret. Nothing in Isaiah 28 was secret. And nothing in the passages Paul’s been quoting throughout Romans 9, 10, and 11 was secret. They were spoken openly by the prophets and that’s why Paul keeps quoting them.
Romans 10 is not primarily explaining the revelation of the mystery. It’s explaining Israel’s unbelief.

Notice the pattern:
In Romans 10:11 Paul quotes Isaiah to establish the necessity of belief:
“Whosoever believeth on him shall not be ashamed.”

That’s the heart.
In Romans 10:13, Paul quotes Joel to establish the necessity of calling upon the Lord.
That’s the mouth.
Heart and mouth.
Belief and confession.

Moses taught it. Isaiah taught it. Joel taught it. Jesus taught it. Paul’s proving that Israel’s future kingdom salvation required both.
The tragedy is that Israel would do neither. Christ stood in their midst, yet they stumbled over Him. They wouldn’t believe who He was. They wouldn’t confess Him as Lord.

So Romans 10:13 is not Paul’s summary of the mystery gospel. It’s another prophetic witness against Israel’s unbelief.

Paul’s argument is simple: Israel’s own Scriptures testified that they needed to believe and call upon the Lord. The prophets taught it. The Lord Jesus taught it. The apostles preached it. Yet the nation largely rejected the very One whom those Scriptures pointed to.

That’s why Romans 10 is such a powerful chapter. It is not showing that God failed Israel. It is showing that God’s Word was consistent all along. The problem was never with the promises. The problem was never with the prophets.
The problem was unbelief.

Many people get confused when they read Romans 10, when they assume that anything mentioning faith, salvation, Christ’s death, or Christ’s resurrection must automatically be Paul’s mystery message for the Body of Christ. But that’s not necessarily true.

The Old Testament taught that Israel would need God’s mercy because of their sins. It taught that they’d have to turn to Him in faith. It taught that they’d have to confess the Lord and call upon His name. None of that began with Paul.
Even the death of Christ was prophesied.
Isaiah 53 foretold His suffering. Psalm 22 described details of His crucifixion centuries before it happened. The resurrection was prophesied too. Peter quoted Psalm 16 in Acts 2 and Acts 3 to prove that Christ would rise again.

So when Romans 10:9 speaks of believing that God raised Christ from the dead and confessing Jesus as Lord, those truths are not unique to Paul’s revelation. Someone could learn them from prophecy. Peter preached them. The prophets foretold them.
The same is true of faith. Faith didn’t begin with Paul.
Abraham was justified by faith. David spoke of faith. Moses spoke of faith, and Paul himself uses those men as examples. The necessity of faith isn’t a mystery truth. It’s found throughout Scripture.

Also, the fact that Jews and Gentiles are both sinners isn’t a mystery.
The Old Testament taught that God is no respecter of persons. Gentiles receiving blessing wasn’t a mystery either. God promised Abraham that all families of the earth would be blessed through him. The prophets repeatedly spoke about Gentiles receiving mercy and salvation.

Even a worldwide proclamation of salvation was foretold.
The prophets envisioned the nations streaming to the light of Israel’s kingdom. Jesus Himself commanded His apostles to take the message into all the world.
So what is the mystery?
The mystery’s not simply that Christ died and rose again.
The mystery is that His death becomes our death, and His resurrection becomes our resurrection through identification with Him.
The mystery is that salvation is offered today apart from Israel’s covenants, apart from Israel’s kingdom, apart from circumcision, apart from confession, apart from law-keeping, and apart from any covenant status.
That truth is uniquely revealed through Paul.

This is why Romans 10 must be read carefully.
The chapter is full of prophecy. Paul quotes Moses, Isaiah, David, and Joel. He’s explaining Israel’s situation using Israel’s Scriptures.
He’s not primarily explaining the revelation of the mystery here.

When Paul says there’s “no difference between the Jew and the Greek,” he’s saying there is no difference regarding sin, faith, mercy, and the need for one Lord. Jews and Gentiles both need God’s grace.
But that’s different from what Paul later reveals concerning the Body of Christ.
One statement speaks about equality before God as sinners while the other speaks about an entirely new creature.

In the Body of Christ, our identity is no longer found in Israel or among the nations. Our identity is found in Christ Himself.
That’s mystery truth.
Salvation apart from Israel’s kingdom is also mystery truth.
Isaiah 28 and Joel 2 spoke about Israel’s future salvation in the kingdom. But God’s dispensing grace today, in this present evil world, apart from Israel’s rise, and that truth belongs to the revelation given to Paul.

So what was Israel supposed to do?
Romans 10 has answered that question repeatedly.
They were supposed to believe in their heart that Jesus was who He claimed to be. They were to confess Him as Lord. And yet they stumbled over the very Stone God had laid in Zion.
That’s the heart of Romans 10: God’s Word stood true, the prophets stood true, Christ stood true, and Israel’s stumbling was ultimately the result of unbelief. May God bless you with the knowledge of Him through His precious Word.