Hear he uses the illustration of a pool of water (small or large) that an individual looks into and calls us to think of what we “see” there and what that implies. Just as water reflects a person’s actual appearance, so the heart reflects a person’s true nature (v. 19). Looking at a reflection in water is an experience common to all people, but who is able to see into the heart? Proverbs indicates that while a person may conceal or reveal his heart through speech and actions, it lies open and transparent only before God (see 21:2).
The comparisons of 27:19–22 draw attention to the state of the person’s heart: