Matthew 5:28 teaches that lust is a matter of the heart, not only of outward action. Jesus says that a man who looks at a woman with the intent of desiring her has already committed adultery in his heart. The words come from Jesus himself, spoken during the Sermon on the Mount to the crowds and his disciples gathered on a hillside in Galilee.
But I tell you that everyone who gazes at a woman to lust after her has committed adultery with her already in his heart.
Matthew 5:28 (WEB)
What Matthew 5:28 Means
The verse begins with “but I tell you,” a phrase Jesus uses several times in this part of the sermon. He is not throwing out the Old Testament command against adultery. He is showing its full reach. The law addressed the act, and Jesus pushes the question inward to the desire that drives the act.
The key verb is “gazes,” which describes a steady, deliberate looking, not a passing glance. The next words, “to lust after her,” name the purpose behind the look: the eyes are being used to feed a craving for what is not one’s own. The verse is describing a person who has chosen to dwell on another person as an object of desire.
What the verse does not say is that noticing someone’s beauty is sinful, or that every thought that flickers across the mind is a fall. It addresses a settled direction of the heart. It also does not reduce sin to a feeling with no bearing on conduct. Jesus is calling people to honesty about where their desires are leading them.
The Context of Matthew 5:28
Matthew, traditionally identified as the tax collector who became one of the twelve apostles, wrote this Gospel for a community with a strong Jewish background. His readers would have known the Ten Commandments well, including the prohibition against adultery. In the verses just before this one, Jesus has been saying that he came to fulfill the law, not abolish it, and that righteousness must exceed the scribes and Pharisees.
The verses that follow (Matthew 5:29-30) move directly from the heart to the body. Jesus says that if the right eye or right hand causes a person to sin, it is better to lose that member than to be thrown into Gehenna. Read in that setting, verse 28 is a call to take sin seriously at its source, and the hard sayings that come next are an urgent illustration of that same seriousness.
Key Phrases in Matthew 5:28
Job 31:1
“I made a covenant with my eyes, how then should I look lustfully at a young woman?
(WEB)
Job describes making a covenant with his eyes not to look lustfully at a young woman. His words show that the discipline of the gaze has long been understood as part of faithful living, and they echo the concern Jesus raises about the eyes in the Sermon on the Mount.
Proverbs 4:23
Keep your heart with all diligence, for out of it is the wellspring of life.
(WEB)
This proverb urges vigilance over the heart because life flows from it. It provides the wisdom behind Jesus’ focus on inward desire, showing that guarding the heart is the root of guarding every other part of one’s life.
A Short Prayer From Matthew 5:28
Lord, you see what I look at when no one else is watching, and you know the thoughts I return to when I am tired or lonely. I confess that my eyes and my desires have sometimes wandered toward what is not mine to take. Search my heart and show me where I have been feeding a craving. Give me a clean heart and a steady gaze, and help me turn toward what is good, true and honoring to you. Amen.
