Matthew 15:18-20
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. These are what defile a person. But to eat with unwashed hands does not defile anyone.”
English Standard Version (ESV)
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This verse isn't just saying that bad words are bad. It's revealing that the origin of our outward speech—every word, whether spoken or thought—is the heart. This means that what we say is less about a momentary lapse and more a symptom of what's truly being cultivated within us.
Jesus has just finished a sharp exchange with the Pharisees about ritual purity laws, explaining that true defilement comes not from external things like unclean food, but from the inner person. He then calls the crowds closer to explain that what a person says reveals the true state of their heart, which is the source of all moral corruption.
Ever notice how a single word can change the whole mood of a conversation? Jesus says it's no accident.
Jesus is drawing a direct line between what we say and what's going on inside us. He's not just talking about speech, but about the whole inner person – the 'heart' is where our thoughts, desires, and intentions originate. When we speak, especially when we say things that are harsh, untrue, or hurtful, Jesus is saying that this isn't random. These words are like little flags, waving out from the deep wellspring of our heart, revealing what's truly there.
Think about it: If your heart is full of anger, your words might become sharp. If it's full of greed, your words might become deceitful or boastful. Jesus is making it clear that our speech is a window into our internal spiritual condition. The words aren't the source of defilement, but they are the evidence of it, broadcasting the heart's true state to the world.
We often try to look good on the outside. But Jesus points us to a deeper, more radical source of purity.
Jesus is challenging the common idea that external actions or rituals are what make a person clean before God. The Pharisees, and many others, focused heavily on outward traditions – like ceremonial washings – to maintain purity. But Jesus cuts through that focus.
He declares that true defilement isn't caused by what we eat or by not washing our hands. Those are external. The real pollution, the kind that damages our relationship with God and others, comes from inside. It's the evil thoughts, the malice, the deceit, the immorality that originate in the heart. Therefore, true purity isn't about following a set of rules to keep the outside clean; it's about the heart being cleansed and transformed by God. This internal transformation is what truly makes a person pure in His sight.
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
This teaching comes during Jesus' public ministry, directly addressing the hypocrisy of some religious leaders and correcting a misunderstanding about ritual purity versus the deep-seated sin of the heart.
c. AD 28-30
Jesus' Public Ministry
Jesus begins teaching, healing, and gathering disciples throughout Galilee and Judea, challenging religious traditions.
c. AD 29-30— this verse
Conflict with Pharisees over Tradition
Jesus and his disciples encounter Pharisees who question why they don't follow ritual hand-washing laws before eating, highlighting a key area of theological and practical disagreement.
c. AD 30
Jesus Teaches About True Purity
In response to the Pharisees' criticism, Jesus teaches the crowds and his disciples that true defilement comes not from external things, but from the sinful intentions and actions originating in the human heart.
This passage directly parallels Matthew 15:18, stating that a good person brings good things out of their good treasure, while a bad person brings evil things out of their evil treasure, emphasizing the heart as the source of our words and actions.
Jeremiah 17:9This verse describes the heart as deceitful and desperately wicked, providing the foundational understanding of the human condition that Jesus is addressing – the inner corruption that leads to outward defilement.
Romans 3:10-18This passage graphically describes the universal sinfulness stemming from the heart, echoing Jesus' point that corruption originates from within and affects every aspect of a person's words and deeds.
Proverbs 4:23This verse is a direct exhortation to 'guard your heart with all vigilance, for from it flow the springs of life,' reinforcing the critical importance of the heart's condition as the source of all that we are and do.
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…
This verse isn't just saying that bad words are bad. It's revealing that the origin of our outward speech—every word, whether spoken or thought—is the heart. This means that what we say is less about a momentary lapse and more a symptom of what's truly being cultivated within us.
Jesus has just finished a sharp exchange with the Pharisees about ritual purity laws, explaining that true defilement comes not from external things like unclean food, but from the inner person. He then calls the crowds closer to explain that what a person says reveals the true state of their heart, which is the source of all moral corruption.
Jesus has just finished a sharp exchange with the Pharisees about ritual purity laws, explaining that true defilement comes not from external things like unclean food, but from the inner person. He then calls the crowds closer to explain that what a person says reveals the true state of their heart, which is the source of all moral corruption.
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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. These are what defile a person. But to eat wit…" — This verse isn't just saying that bad words are bad. It's revealing that the origin of our outward speech—every word, whether spoken or thought—is the heart. This means that what we say is less abo…
