What does Proverbs 6:29 mean?

Scripture affirms that adultery will not go unpunished. The earthly consequences might be known only to a few people, and in some cases might even be minor. But they're always there, in some way, shape or form (Proverbs 6:27–28). More importantly, sin carries eternal consequences.

Adultery begins with a look that entices someone to anticipate pleasure, but it leads inevitably to pain and punishment. This is partly because adultery almost always leads to other sins, mostly to cover up the act. David's sin with Bathsheba led him to conspiracy and even murder by proxy (2 Samuel 11). He confessed with bitter tears and received forgiveness (Psalm 51:1–2), but he paid a penalty for his transgression. The child born of the adultery died (2 Samuel 12:7–15), and turmoil afflicted his household for the rest of his life. He even experienced the fury of a jealous, biiter son, Absalom, who led a rebellion and tried to steal the kingdom from him.

Solomon emphatically points out that whoever commits adultery with his neighbor's wife will be punished. An adulterer may think his sin is a secret, as David did, but God sees all and knows all. He has warned, "Be sure your sin will find you out" (Numbers 32:23). It is important to guard one's eyes to avoid falling prey to seduction and experiencing punishment for that sin. Job testifies in Job 31:1: "I have made a covenant with my eyes; how then could I gaze at a virgin?"