Matthew 15:18-19
But what comes out of the mouth proceeds from the heart, and this defiles a person. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander.
English Standard Version (ESV)
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What Jesus highlights is that the origin of defilement isn't external food or rituals, but the inner thoughts and intentions of the heart. This means that even before an action takes place, the thought itself has already begun to pollute a person, revealing the heart as the true source of sin.
Jesus has just finished confronting the Pharisees' hypocrisy regarding ritual purity and the Oral Law, explaining that true defilement doesn't come from unclean food but from what comes out of a person. He then calls the crowd closer to explain directly: what a person says and does originates in their inner being, their heart, and it is this inner corruption that truly makes them unclean.
Jesus declared a radical truth: defilement doesn't come from the outside in, but from the inside out. What does this say about our inner lives?
Jesus is cutting through the superficiality of religious ritual. He's saying that what we say, and by extension, what we do, isn't the real problem. The real problem is the internal condition of our hearts. Our words are like the visible overflow from a hidden wellspring. If the well is polluted, the overflow will be too. This means our thoughts, desires, and intentions are the true source of moral and spiritual contamination.
We often think of defilement as being dirty or impure. But in Jesus' day, it had a deeper spiritual and communal meaning. What are we truly being set apart from?
The word Jesus uses here, 'defiles,' carries the weight of spiritual impurity and separation from God's holiness. In the Old Testament context, being 'defiled' meant becoming ceremonially unclean, unfit for worship or fellowship with God. Jesus is redefining this. He's saying that it's not external rituals or food laws that make us unclean before God. Instead, it’s the sinful thoughts and intentions originating from our hearts that truly separate us from God's presence and render us spiritually unfit. This impurity isn't just personal; it impacts our relationship with God and the community of faith.
Understand the original words
kardia · Greek Noun
The center of a person's being, encompassing the mind, will, emotions, and moral character. In biblical theology, it is the source of all intentions and the seat of man's moral activity.
koinoō · Greek Verb
To make ceremonially or morally impure; to render someone unfit for holy presence or fellowship with God. It signifies corruption that separates one from God’s holiness.
dialogismoi ponēroi · Greek Noun phrase
Thoughts, intentions, or deeds that are morally wicked, malicious, or opposed to God’s nature and commands. It represents the fallen state of humanity's internal motivations.
phonoi · Greek Noun
c. AD 27-30
Jesus' Public Ministry
Jesus travels throughout Galilee and Judea, teaching, healing, and gathering disciples. His ministry challenges religious traditions and authorities.
c. AD 27-30— this verse
Clashes with Pharisees
Jesus frequently engages in disputes with the Pharisees and other religious leaders over interpretations of Jewish law, purity rituals, and the authority of tradition.
c. AD 30-33
Jesus' Trial and Crucifixion
Following escalating conflict with religious and political powers, Jesus is arrested, tried, and crucified in Jerusalem.
This passage directly parallels Matthew 15:18, stating that a person's words reveal the abundance of their heart, whether good or evil, highlighting the heart as the source of what is spoken.
Jeremiah 17:9This verse describes the human heart as deceitful and desperately wicked, providing the underlying reason why the words and actions that proceed from it are often impure and defiling, as Jesus states in Matthew 15:18.
Romans 10:9-10This passage connects confession (spoken words) with belief in the heart, illustrating how what is spoken outwardly is a direct outflow of the inner conviction and state of one's heart, echoing Jesus' teaching in Matthew 15:18.
Proverbs 4:23This verse urges diligence in guarding one's heart above all else, 'for out of it flow the springs of life,' reinforcing the profound truth in Matthew 15:18 that the heart is the origin of everything that defiles us.
barnesMatthew 15:18: "But those things which proceed out of the mouth come forth from the heart; and they defile the man."
Christ proceeds to state what does defile the man, or render him a sinner: 1. "Evil thoughts" These are the first things - these are the fountains of all others. Thought precedes action. Thought, or purpose, or motive, gives its character to conduct. All evil thoughts are here intended. Though we labor to suppress them, yet they defile us. They leave pollution behind them. 2. "Mu…
calvinMatthew 15:10-20: "And he called the multitude, and said unto them, Hear, and understand:"
- And having called the multitudes to him, he said to them, Hear and understand. 11. What entereth into the mouth polluteth not the man, but what goes out of the mouth polluteth the man. 12. Then his disciples approaching said to him, Knowest thou that the Pharisees were offended when they heard that saying? 13. But he answering, said, Every plant which my heavenly Father hath not planted shall be roote…
What Jesus highlights is that the origin of defilement isn't external food or rituals, but the inner thoughts and intentions of the heart. This means that even before an action takes place, the thought itself has already begun to pollute a person, revealing the heart as the true source of sin.
Jesus has just finished confronting the Pharisees' hypocrisy regarding ritual purity and the Oral Law, explaining that true defilement doesn't come from unclean food but from what comes out of a person. He then calls the crowd closer to explain directly: what a person says and does originates in their inner being, their heart, and it is this inner corruption that truly makes them unclean.
Jesus has just finished confronting the Pharisees' hypocrisy regarding ritual purity and the Oral Law, explaining that true defilement doesn't come from unclean food but from what comes out of a person. He then calls the crowd closer to explain directly: what a person says and does originates in their inner being, their heart, and it is this inner corruption that truly makes them unclean.
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The intentional killing of a human being. Biblically, it is viewed as a violation of God’s image in man and a supreme act of disobedience against the sanctity of life.
moicheiai · Greek Noun
Voluntary sexual intercourse between a married person and someone other than their spouse. It represents a breach of the marriage covenant and a violation of God's design for human intimacy.
porneiai · Greek Noun
A broad category covering all forms of sexual activity outside of the covenant of marriage between a man and a woman, viewed as a corruption of God's moral order.
klopai · Greek Noun
The act of taking someone else's property without consent. It is fundamentally a violation of the neighbor’s rights and an expression of covetousness.
pseudomartyriai · Greek Noun
Giving untruthful or misleading testimony against another person. It is a direct violation of God’s command to love one's neighbor and maintain justice.
blasphēmai · Greek Noun
Injurious or defamatory speech against others. It is the verbal expression of malice and a failure to use the tongue in a way that honors God and neighbor.
"But what comes out of the mouth proceeds from the heart, and this defiles a person. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander." — What Jesus highlights is that the origin of defilement isn't external food or rituals, but the inner thoughts and intentions of the heart. This means that even before an action takes place, the tho…
