It is easy to read “You shall not commit adultery” and decide that command belongs to someone else. But in Matthew 5, Jesus carries it beyond the outward act into the hidden life of our looks, desires, and thoughts—so where does that leave any of us, and why does God care so deeply about our purity?

We’re good at looking pure—saying the right things, following the right rules, putting on the kind of life that earns approving nods—and that’s precisely the trap Jesus names in Matthew 5:8 when he calls the pure in heart blessed, not the pure in appearance.