Good sense is a fountain of life to the one who has it, but the discipline of the senseless is folly.
In context
20Whoever attends to a word will find good, and happy is the one who trusts in Yahweh. 21The wise in heart is called discerning, and sweetness of speech adds to learning. 22Good sense is a fountain of life to the one who has it, but the discipline of the senseless is folly. 23The heart of the wise makes his mouth wise and adds learning to his lips. 24Gracious words are a honeycomb, sweet to the soul and healing to the bones.