Proverbs 15:2-4, 7, 23

The tongue of the wise speaks knowledge that is pleasing and acceptable, But the [babbling] mouth of fools spouts folly. The eyes of the LORD are in every place, Watching the evil and the good [in all their endeavors]. [Job 34:21; Prov 5:21; Jer 16:17; 32:19; Heb 4:13] A soothing tongue [speaking words that build up and encourage] is a tree of life, But a perversive tongue [speaking words that overwhelm and depress] crushes the spirit.

The lips of the wise spread knowledge [sifting it as chaff from the grain]; But the hearts of [shortsighted] fools are not so.

A man has joy in giving an appropriate answer, And how good and delightful is a word spoken at the right moment—how good it is!