If you want to improve, be content to be thought foolish and stupid.
Wealth is the slave of a wise man. The master of a fool.
We suffer more often in imagination than in reality.
No man is crushed by misfortune unless he has first been deceived by prosperity.
If anyone is unhappy, remember that his unhappiness is his own fault. Nothing else is the cause of anxiety or loss of tranquility except our own opinion.
It is impossible for a man to learn what he thinks he already knows.