Matt 12:31–37 — The Unpardonable Sin

Jesus says in Matthew 12:31–32 that every sin and blasphemy will be forgiven, but blasphemy against the Holy Spirit will not be forgiven, either in this age or in the age to come. This is a difficult text. Preachers and theologians throughout church history have wrestled with what Jesus means by this unpardonable sin.

The context is essential. People sometimes remember only the alarming phrase, “will not be forgiven,” without considering the argument in which it appears. As a result, even regenerate Christians may fear that an unwelcome thought or a careless word has placed them beyond forgiveness. The context will help us understand both Jesus’ warning and the comfort it provides to God’s people.

The Context: Christ’s Kingdom

Jesus had performed an astounding miracle. A demon-oppressed man was blind and mute, and Jesus healed him by the power of the Holy Spirit. The miracle demonstrated that Jesus is the Messiah. The crowds began to reach the correct conclusion, asking, “Can this be the Son of David?” They were not entirely certain, but the accumulating evidence suggested that Jesus was indeed the anointed one promised in the Old Testament.

The Pharisees would have none of it. They had already begun plotting to kill Jesus after he healed a man on the Sabbath. Troubled that the crowds were considering whether he might be the Messiah, they made a blasphemous charge: “It is only by Beelzebul, the prince of demons, that this man casts out demons.” Beelzebul is another name for Satan. The Pharisees attributed the work of the Holy Spirit to the devil.

Matthew 12:25–37 is one continuous response to that accusation. This is important because verses 33–37, concerning the tree and its fruit, are sometimes treated as an independent saying. In fact, they continue Jesus’ answer to the Pharisees and clarify statements that might otherwise sound troubling, including, “By your words you will be justified, and by your words you will be condemned.”

Jesus first exposes the incoherence of their charge. Satan would not cast out Satan, for a kingdom divided against itself cannot stand. Their accusation is not a rational conclusion comparable to the crowd’s growing conviction that Jesus is the Messiah. It proceeds from anger, malice, and hatred. They seek to slander Christ and diminish him in the eyes of the crowd.

Jesus then gives the true explanation: “If it is by the Spirit of God that I cast out demons, then the kingdom of God has come upon you.” He has entered the strong man’s house and bound him. As we saw in the previous passage, Christ binds Satan through his death and resurrection. From his ascended glory, through the gift of the Holy Spirit and the preaching of the gospel, he now plunders the strong man’s house. Each time a sinner is effectually called, that person is transferred from Satan’s kingdom into Christ’s kingdom.

This reveals the spiritual nature of Christ’s kingdom. Jesus did not come to restore national Israel by expelling the Romans. He came to transfer his elect people from the kingdom of Satan into his own kingdom of salvation. His physical healings served as outward signs of the inward grace of the gospel—the forgiveness of sins and spiritual healing received through faith in Christ.

No Middle Ground

In verse 30, Jesus declares, “Whoever is not with me is against me, and whoever does not gather with me scatters.” This statement reaches back to verse 27, where Jesus asks the Pharisees, “If I cast out demons by Beelzebul, by whom do your sons cast them out?” Their “sons” are not necessarily biological descendants but their followers. Some Jewish exorcists claimed to cast out demons, even though they did not possess the messianic authority of Jesus or the anointing of the Spirit.

The existence of these exorcists raises a question. They appear to be doing something similar to Jesus and his disciples, but they do not believe in Christ or belong to his followers. Where do they stand in this kingdom movement? Jesus answers that there is no middle ground. Those who are not with him are against him. Although the Jewish exorcists may appear to gather God’s people, they actually scatter because they are separated from Christ. Christ is Lord, and he demands total commitment.

Blasphemy Against the Holy Spirit

It is in this context that Jesus says, “Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven.” Blasphemy is defiant, contemptuous speech against God. Why, then, is blasphemy against the Holy Spirit unpardonable, and what exactly does this sin involve?

Interpretations in Church History

Some interpreters hold that this sin could be committed only during the age of miracles. On this view, it consists specifically in attributing Jesus’ miracles—or perhaps the signs performed by the apostles for a short time after the resurrection—to Satan rather than the Holy Spirit. Since we no longer live in that age, the sin cannot be committed today. This interpretation has some plausibility because it fits the immediate setting. Nevertheless, Jesus generalizes his warning: “Whoever speaks against the Holy Spirit will not be forgiven.” His language appears broader than one accusation made at one moment in redemptive history.

Augustine offered another influential interpretation. He understood the sin as obstinate distrust of the pardon God offers through the church. His reasoning was that pardon is a primary gift of the Holy Spirit, the Spirit resides in the church, and the church possesses the keys of the kingdom. On that understanding, however, a person finally commits the sin only by persisting in impenitence until death. Calvin objected that this does not fit Jesus’ statement that the sin will not be forgiven “in this age” as well as in the age to come. Augustine’s view effectively places its completion only in the age to come.

The Lutheran interpretation connects this passage with Hebrews 6:4–6. On that view, the unpardonable sin is committed by a regenerate person who once believed but later rejects the gospel and falls from grace. As Reformed Christians, we reject the idea that a person who has truly been saved can fall from the state of grace. We understand those in Hebrews 6 who were enlightened, tasted the heavenly gift, and shared in the Holy Spirit as people who outwardly professed faith and experienced the blessings surrounding the covenant community without being inwardly regenerated.

Common Fears

Popular fears about this sin also require careful correction. John Bunyan, before coming to a settled assurance, was tormented by unwanted blasphemous thoughts. His experience resembled what we might call spiritual obsessive-compulsive disorder: thoughts he hated repeatedly invaded his mind, and he feared that they constituted the unpardonable sin.

Others fear that they have spoken an irreverent word in the heat of the moment, misused God’s name, or made a flippant remark in anger. They imagine that once the word has escaped their lips, they are condemned forever even if they grieve over it and repent.

Still others worry about seasons of serious doubt. A person raised in the church may spend years wrestling with whether Scripture is truly God’s Word, whether Jesus is the Son of God, or whether the gospel is true. Another believer may experience spiritual depression, feel distant from God, or become angry during deep suffering. The Psalms include cries from those who feel abandoned, and Job at times speaks with a degree of defiance in his anguish. None of these experiences, in themselves, is the sin Jesus describes.

The Reformed Understanding

The Reformed interpretation connects the sin firmly to the historical setting without limiting it to the earthly ministry of Christ. Jesus’ use of “whoever” gives the warning a broader application. The parallel in Luke 12:10 also places it in a setting that looks toward the apostles’ witness after Christ’s ascension.

Louis Berkhof defines the sin as “the conscious, malicious, and willful rejection and slandering, against evidence and conviction, of the testimony of the Holy Spirit respecting the grace of God in Christ” (Systematic Theology, 2021 Banner of Truth edition, p. 252, in the section on “Man in the State of Sin”).

In the immediate context, the Spirit testifies to Christ’s messianic office through his power to cast out demons. The crowds see this testimony and begin to ask whether Jesus is the Son of David. The Pharisees also see the evidence, but they knowingly and maliciously attribute the Spirit’s work to Satan.

The Holy Spirit’s official work is to testify to Christ and reveal his deity and glory. At his baptism, the Spirit came upon Jesus and anointed him for his messianic ministry. This does not imply that Jesus was merely human until the Spirit empowered him. He is the eternal Son of God, fully divine. Yet as the incarnate Son in his state of humiliation, he took the form of the Lord’s servant and received the Spirit for his mediatorial work. Through that work, the Spirit made known Christ’s divine identity, authority, and glory.

Blasphemy against the Spirit occurs when someone encounters this testimony, recognizes its truth, and cannot honestly deny it, yet deliberately hardens himself against it and maliciously attributes it to the powers of darkness. This application extends beyond the age of miracles because the Spirit continues to testify to Christ through Holy Scripture. In the Gospels, we read the Spirit’s testimony concerning the mighty works of Jesus, the anointed Messiah and servant of the Lord. A person who knowingly and maliciously rejects the Spirit’s witness to Christ in God’s Word manifests the same kind of sin.

Why It Is Unpardonable

The sin is not unpardonable because God would refuse someone who truly repented. We must not imagine a person coming to his senses, confessing that Jesus is Lord, seeking mercy, and being turned away because he once committed this sin. Rather, blasphemy against the Holy Spirit flows from a heart so hardened that it cannot repent. The inability to receive pardon lies in the impenitent character of the sin itself.

This passage is therefore not intended to terrify God’s true children who struggle with doubts, unwanted thoughts, or spiritual depression. Its logic points in the opposite direction. Jesus says that every other sin and blasphemy can be forgiven. If you fear that you may have committed the unpardonable sin, that fear itself indicates a tender conscience rather than a heart permanently hardened in malignant opposition to Christ.

The Tree and Its Fruit

Jesus explains this connection between speech and the heart in verses 33–35: “Either make the tree good and its fruit good, or make the tree bad and its fruit bad, for the tree is known by its fruit.” The Pharisees’ blasphemous accusation is the bad fruit. It comes from bad trees—from hearts filled with sin, anger, and hatred toward Christ. They are committed to diminishing him before the crowds and are already plotting to destroy him.

Jesus applies the image directly: “You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.” John the Baptist used the same description when the Pharisees came to his baptism. The crowds are beginning to speak good by asking whether Jesus might be the Son of David, but the Pharisees cannot join them because evil fills their hearts. “The good person out of his good treasure brings forth good, and the evil person out of his evil treasure brings forth evil.”

The blasphemy against the Holy Spirit, then, is not a single careless word or an involuntary slip of the tongue. It is the fruit of deep-seated malice toward Christ and the gospel. The words expose a settled condition of the heart.

Every Careless Word and Final Judgment

In verses 36–37, Jesus warns the Pharisees about the coming judgment: “On the day of judgment people will give account for every careless word they speak, for by your words you will be justified, and by your words you will be condemned.” The word translated “careless” can also mean “useless.” In this context, it includes the Pharisees’ useless and blasphemous claim that Jesus casts out demons by Beelzebul.

This is not a statement of the gospel. Jesus is not teaching that sinners gain forgiveness and entrance into heaven by maintaining perfect speech. He is stating the strict and unalloyed demand of God’s law. The idea that a person’s own words condemn or testify against him appears elsewhere in both Testaments. Jesus has already used this reasoning in verse 27: the Pharisees’ approval of their own exorcists exposes the inconsistency of attributing his works to Satan. Their own words testify against them.

Jesus employs the strictness of the law to awaken unbelievers to their danger and show them their need for Christ. He does something similar with the rich young ruler. When asked, “What must I do to inherit eternal life?” Jesus directs him to the commandments. He is not presenting obedience to the law as the gospel; he is using the law to expose the man’s sin and need of a Savior. In the same way, Matthew 12:36–37 is not a threat that believers will ultimately be condemned for every careless word. It is law spoken to hardened unbelievers to drive them to Christ.

Four Marks of the Unpardonable Sin

Four qualities distinguish the sin Jesus describes.

First, it is willful. Unwanted blasphemous thoughts, such as those that tormented Bunyan, and involuntary words spoken in the heat of the moment do not meet this description.

Second, it is knowing. This is the central feature. The person sins against clear light and evidence. The Pharisees had irrefutable testimony before their eyes that Jesus was the Messiah. They could not refute his mighty works, yet they denied the truth they recognized. Calvin says that they “raged against God himself, that is, the doctrine which they knew to be of God.”

Third, it is persistent. The sin reflects a permanently hardened heart, not an isolated act. The mouth speaks from the abundance of the heart; the blasphemous words are fruit growing from a settled state of opposition to God.

Fourth, it is malignant. This is more than uncertainty, ordinary unbelief, or intellectual skepticism. It is a poisonous hatred of Christ. The Pharisees were already plotting to kill him, and their charge that he acted by the prince of demons expressed that malice.

Acts 7 gives another picture of such malignancy. When Stephen exposed Israel’s repeated rejection of God’s messengers, his hearers were enraged and ground their teeth at him. They cried out, stopped their ears, rushed upon him, and stoned him. Their reaction displayed more than a lack of belief. It was a poisonous rejection of Christ that seemed animated by the powers of darkness.

Pastoral Application

Be Alert to Satan’s Malice

The words and actions of the Pharisees remind us who Satan is. He is an enemy of God and everything good. He hates and slanders the truth. In the Garden of Eden, he told Eve that God had lied about the consequence of eating the forbidden fruit and implied that God did not have her best interests at heart. He is full of malice, envy, anger, and hatred. Although we may prefer not to dwell on such darkness, we must remain spiritually alert to his character and activity.

We must also recognize that those who maliciously attack Christ and his church give voice to the evil one’s blasphemies. This does not describe every unbeliever or secular person who gives little thought to religion. It concerns those whose opposition to Christ takes the form of active malice. They hate Christians not because there is anything impressive about us, but because we belong to Christ. Throughout church history, this malignant hatred has repeatedly erupted in persecution, from the Roman Empire to persecution in the present world.

Take Comfort in Christ’s Pardon

The most important application, however, is comfort. Jesus’ teaching about the unpardonable sin has an encouraging reverse side. If this is the one sin that cannot be pardoned, every other kind of sin can be forgiven. What finally keeps a person from heaven is impenitence and unbelief: rejecting Christ rather than confessing sin and seeking God’s grace in him.

If you worry that you have committed this sin, your very concern indicates that your conscience remains tender. You have not hardened your heart into settled, willful, and malignant opposition to Christ. You may have endured spiritual depression, serious doubt, or a painful struggle with sin. You may feel that your failures are beyond repair. Yet neither the number nor the depth of your sins exceeds the sufficiency of Christ.

George Whitefield expressed this comfort well: “Were our sins more in number than the hairs of our head, or of a deeper dye than the brightest scarlet; yet the merits of the death of Jesus Christ are infinitely greater, and faith in his blood shall make them white as snow.”