Iron is sharpened by iron: so doth a man sharpen himself on the countenance of his friend.

Provérbios 27:17

For where there is much wisdom there is much vexation: and he that increaseth knowledge increaseth pain.

Eclesiastes 1:18

Happy the man that hath found wisdom, and the man that acquireth understanding.

Provérbios 3:13

He that getteth intelligence loveth his own soul: he that guardeth understanding will find happiness.

Provérbios 19:8

Even a fool, when he keepeth silence, is counted wise: he that shutteth his lips is esteemed a man of understanding.

Provérbios 17:28

A fool contemneth the correction of his father; but he that observeth admonition will become prudent.

Provérbios 15:5

The prudent foreseeth the evil, and hideth himself; but the simple pass on, and are punished.

Provérbios 27:12