What does Proverbs 30:20 mean?
The primary meaning of this verse stands alone, regardless of how one interprets the prior passage. In the last several verses, Agur (Proverbs 30:1) noted several ideas which are mysterious (Proverbs 30:18–19). One common understanding of those examples is they all leave no immediate trace: birds in flight, snakes on rocks, boats in rough water, and "the way of a man with a virgin." Taken in this way, the implication is that sexual intercourse leaves no obvious, clear evidence in the moments after it has occurred. If, indeed, that was Agur's point, then this verse reinforces a similar idea.In this context, an "adulteress" suggests a woman who makes a habit of sexual immorality. However, she is not the least bit concerned about her sinful behavior. The commandment, "You shall not commit adultery" (Exodus 20:14) means nothing to her. She has such a casual attitude about her sexual liaisons that they are as meaningless as eating and wiping her mouth. She commits adultery routinely and brushes off the sin she has committed.
It is possible for a sinner to sear his conscience. Paul described certain false teachers as having a seared conscience (1Timothy 4:2). Punishment awaits an adulteress who does not repent. Jude 1:7 mentions a punishment of eternal fire for the inhabitants of Sodom and Gomorrah, who "indulged in sexual immorality." He writes that they serve as an example of punishment. A casual approach to sin will come to an abrupt and terrifying halt.