He is a drunkard who takes more than three glasses though he be not drunk.

Appear to know only this--never to fail nor fall.

If someone speaks badly of you, do not defend yourself against the accusations, but reply; "you obviously don't know about my other vices, otherwise you would have mentioned these as well

The key is to keep company only with people who uplift you, whose presence calls forth your best.

If evil be spoken of you and it be true, correct yourself, if it be a lie, laugh at it.

Bid a singer in a chorus, Know Thyself; and will he not turn for the knowledge to the others, his fellows in the chorus, and to his harmony with them?

Whoever is going to listen to the philosophers needs a considerable practice in listening.