Do not seek dishonest gains: dishonest gains are losses.
Do not seek evil gains; evil gains are the equivalent of disaster
But he who neither thinks for himself nor learns from others, is a failure as a man.
A sparing tongue is the greatest treasure among men.
Neither make thy friend equal to a brother; but if thou shalt have made him so, be not the first to do him wrong.
The fool knows after he has suffered.