“Wise men don't need advice. Fools won't take it.”
“Only fools and dead men don't change their minds. Fools won't and dead men can't.”
“Wise men profit more by fools than fools by wise men.”
“The way of a fool seems right to him, but a wise man listens to advice.”
“Few things are needed to make a wise man happy; nothing can make a fool content; that is why most men are miserable.”
“Rules are for the obedience of fools and the guidance of wise men.”