Take care how you listen to the voice of the flatterer, who, in return for his little stock, expects to derive from you considerable advantage. If one day you do not comply with his wishes, be imputes to you two hundred defects instead of perfections.
Publish not men's secret faults, for by disgracing them you make yourself of no repute.
However much you are read in theory, if thou hast no practice thou art ignorant
The stranger has no friend, unless it be a stranger.
Whoever gives advice to a heedless man is himself in need of advice.
Inflict not on an enemy every injury in your power, for he may afterwards become your friend.