Understanding is a wellspring of life unto him that hath it: but the instruction of fools is folly.
– Proverbs 16:22
The word for understanding means prudence, or good sense. It appears several times in Proverbs and throughout the Old Testament. It was the word used to describe Abigail in 1 Samuel 25:3. We would say she had a good head on her shoulders. Practical wisdom is a life giving blessing (Proverbs 3:22; 14:30), as wellspring of life indicates (Proverbs 10:11; 13:14; 14:27; 18:4). The second phrase is a contrast to the life giving blessing of wisdom. The word for instruction means chastisement, or reproof. Such correction coming from fools is useless, worthless (Proverbs 15:2, 28). If we press the antithetical parallel further, rather than giving life, folly leads to destruction and death (Proverbs 5:23; 14:1).