These are the four abuses: desire to succeed in order to make oneself famous; taking credit for the labors of others; refusal to correct one's errors despite advice; refusal to change one's ideas despite warnings.
A true gentleman makes demands upon himself but not upon others.
He who fails to prepare, prepares to fail
The funniest people are the saddest once
Act with kindness but do not expect gratitude.
A good man will certainly also possess courage; but a brave man is not necessarily good.