Proverbs 15:23 A man has joy by the answer of his mouth: and a word spoken in due season, how good is it! 

‘A man has joy by the answer of his mouth: and a word spoken in due season, how good is it.’ A wise man has joy in his answers of wisdom, and a word spoken in season is healthful and refreshing.

A good man shall be satisfied with the fruit of his lips, and he will reap the good that he sows (12:14; Gal. 6:7-8).

The mouth of a righteous man produces blessing and life (13:2-3; 1Pet. 3:10-11; Jas. 3:1-18). The control of the tongue is commanded by God (Jas. 1:26; 3:1-18). We have two eyes and two ears, suggesting we should see and hear more than speak with the one tongue fenced with teeth.

A man is inwardly satisfied by his wise answers, and his fortune is largely determined by them (18:20). The sayings of a wise man are like deep waters, and his wellspring of wisdom is like a gushing torrent that never runs dry (18:4).