Proverbs 15:2

15:2 The tongue of the wise treats knowledge correctly,

but the mouth of the fool spouts out folly.

Ecclesiastes 10:3

10:3 Even when a fool walks along the road he lacks sense,

and shows everyone what a fool he is.

Ecclesiastes 10:12-14

Words and Works of Wise Men and Fools

10:12 The words of a wise person win him favor,

but the words of a fool are self-destructive.

10:13 At the beginning his words are foolish

and at the end his talk is wicked madness,

10:14 yet a fool keeps on babbling.

No one knows what will happen;

who can tell him what will happen in the future?