# But I say to you

See how you translated this in Matthew 5:22.

# everyone who looks on a woman to lust after her has already committed adultery with her in his heart

This teaches that a man who lusts after a woman is as guilty of adultery as a man who actually commits the act of adultery.

# to lust after her

“and lusts after her” or “and desires to sleep with her”

# in his heart

“in his mind” or “in his thoughts”