Hebrews 6:4–6 Does Not Deny Repentance: St. Ambrose's Interpretation

Introduction

One of the most frequently cited passages against the possibility of repentance after serious sin is Hebrews 6:4–6:

"For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit... and then have fallen away, to restore them again to repentance, since they are crucifying once again the Son of God to their own harm and holding him up to contempt."— Hebrews 6:4–6 (ESV)

Throughout church history, some groups have interpreted this text to mean that a baptized Christian who commits grave sin can never again receive forgiveness. In the fourth century, St. Ambrose of Milan confronted this interpretation directly in his treatise Concerning Repentance. His response remains one of the clearest patristic explanations of the passage.

Rather than teaching that repentance is impossible after baptism, Ambrose argues that Hebrews 6 is primarily teaching the impossibility of repeating baptism, not the impossibility of receiving forgiveness through repentance.

The Context: Paul's Practice Cannot Contradict His Teaching

Ambrose begins with a simple observation.

The Apostle Paul himself restored repentant sinners to communion. In 2 Corinthians 2:6–8, Paul commands the Corinthian church to forgive and comfort the man who had previously been disciplined:

"You should rather turn to forgive and comfort him... so I beg you to reaffirm your love for him."

If Paul personally restored a repentant believer, then he could not simultaneously teach that restoration is absolutely impossible.

As Ambrose writes:

"Could Paul teach in opposition to his own act?... Since, then, he could not destroy what he had built, we must assume that what he says was different from, but not contrary to, what had gone before."
— Concerning Repentance, Book II, Chapter 2, §7

For Ambrose, Scripture interprets Scripture. Paul's pastoral practice proves that Hebrews cannot be read as an absolute denial of forgiveness after baptism.

"Renewed Again" Refers to Baptism

The heart of Ambrose's interpretation lies in the phrase:

"...to be again renewed unto repentance..."— Hebrews 6:6

Ambrose argues that this "renewal" refers specifically to the new birth of baptism.

He points to several passages where Scripture describes baptism as renewal:

Romans 6:3–4 — believers are buried with Christ through baptism and walk in "newness of life."
Ephesians 4:23–24 — Christians are renewed in the spirit and put on the new man.
Ephesians 4:5 — "One Lord, one faith, one baptism."

Ambrose explains:

"We are renewed by means of the laver of baptism, whereby we are born again."
— Concerning Repentance, Book II, Chapter 2, §8

Thus, Hebrews is not saying that repentance itself cannot occur again.

Rather, it teaches that the baptismal regeneration by which a person is first renewed cannot be repeated.

Why Hebrews Mentions "Crucifying the Son of God Again"

Hebrews says that restoring such people would involve

"...crucifying again the Son of God..."

Ambrose connects this directly with Paul's teaching on baptism.

Paul writes:

"All of us who have been baptized into Christ Jesus were baptized into his death."
— Romans 6:3

Likewise,

"Our old self was crucified with him..."
— Romans 6:6

And again,

"Having been buried with him in baptism..."
— Colossians 2:12

According to Ambrose, baptism sacramentally unites the believer with Christ's once-for-all crucifixion.

Therefore, attempting to baptize someone a second time would symbolically attempt to participate once more in Christ's one sacrifice.

As Ambrose concludes:

"Christ was crucified once, and died to sin once, and so there is but one, not several baptisms."
— Concerning Repentance, Book II, Chapter 2, §10

This interpretation fits naturally with Paul's declaration:

"One Lord, one faith, one baptism."
— Ephesians 4:5

Hebrews 6 Does Not Eliminate Ecclesiastical Repentance

Ambrose further argues that if Hebrews were denying all possibility of repentance after baptism, it would contradict the rest of Scripture.

Jesus entrusted the forgiveness of sins to His Church:

"If you forgive the sins of any, they are forgiven them."
— John 20:22–23

Likewise,

"Whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven."
— Matthew 16:19

Paul himself instructed the Corinthians to restore a repentant sinner (2 Corinthians 2:6–8), demonstrating that post-baptismal forgiveness was part of apostolic ministry.

Ambrose therefore insists that Hebrews cannot be interpreted in a way that overturns these clear biblical examples.

A Second Reading: What Is Impossible with Man Is Possible with God

Although Ambrose believes Hebrews primarily refers to baptism, he also considers another possible interpretation.

Suppose, for argument's sake, that Hebrews is speaking directly about repentance.

Even then, he argues, one should remember Christ's own words:

"What is impossible with man is possible with God."
— Luke 18:27

Ambrose writes:

"God is able whenever He wills to forgive us our sins, even those which we think cannot be forgiven."
— Concerning Repentance, Book II, Chapter 2, §12

He illustrates this with Naaman the Syrian (2 Kings 5). Human reason considered it impossible that water could cleanse leprosy, yet God accomplished what seemed impossible.

Likewise, forgiveness through repentance may appear impossible to human judgment, but God has granted this authority through Christ.

Ambrose explains:

"It seemed impossible that sins should be forgiven through repentance, but Christ gave this power to His apostles, which has been transmitted to the priestly office."
— Concerning Repentance, Book II, Chapter 2, §12

Hebrews 6 and the Doctrine of One Baptism

Ambrose also explains why Hebrews later speaks about "washings" or "baptisms" (Hebrews 6:2).

Under the Mosaic Law there were many ritual washings.

The New Covenant replaces those many washings with one definitive baptism.

Thus Hebrews encourages believers to leave behind the old ceremonial washings and embrace the perfection found in Christ.

This reinforces the central point:

many Old Testament washings,
one Christian baptism.

The Harmony of Scripture

Ambrose's interpretation preserves the harmony of the New Testament.

Scripture consistently teaches:

Christ died once for sins (Romans 6:10).
Christians are baptized once into Christ (Ephesians 4:5).
Believers may still fall into sin (1 John 1:8).
Those who repent receive forgiveness (1 John 1:9).
The Church exercises the ministry of forgiveness (John 20:22–23).

Hebrews 6 therefore warns against repeating baptism—not against the possibility of genuine repentance after baptism.

St. Ambrose rejects the claim that Hebrews 6:4–6 permanently closes the door of repentance for fallen Christians.

Instead, he argues that the passage safeguards the uniqueness of baptism. Baptism unites believers once for all with Christ's once-for-all death and resurrection; therefore, it cannot be repeated.

Repentance, however, remains available because Christ entrusted His Church with the ministry of forgiveness. Even if one were to understand Hebrews differently, Ambrose reminds us that God's grace is greater than human impossibility:

"Things which are impossible with men are possible with God."— Luke 18:27

For Ambrose, the message of Hebrews is not despair but confidence in the once-for-all efficacy of baptism, together with hope in the mercy of God extended through repentance.