The best man of all is he who knows everything himself. Good also the man who accepts another's sound advice; but the man who neither knows himself nor takes to hear what another says, he is no good at all.
Invite your friend to dinner; have nothing to do with your enemy.
For both faith and want of faith have destroyed men alike.
Often even a whole city suffers for a bad man who sins and contrives presumptuous deeds.
But he who neither thinks for himself nor learns from others, is a failure as a man.
Do not let any sweet-talking woman beguile your good sense with the fascinations of her shape. It's your barn she's after.