Fools multiply folly

Experience keeps a dear school, but fools will learn in no other, and scarce in that.

The most exquisite folly is made of wisdom too fine spun

The heart of a fool is in his mouth, but the mouth of a wise man is in his heart.

The most exquisite Folly is made of Wisdom spun too fine.

Anger and Folly walk cheek-by-jole; Repentance treads on both their Heels.