In Greece wise men speak and fools decide.

Wise men argue causes; fools decide them.

Wise men speak because they have something to say; Fools because they have to say something.

Logical consequences are the scarecrows of fools and the beacons of wise men.

Wise men don't need advice. Fools won't take it.

Rules are for the obedience of fools and the guidance of wise men.