"When you are going to meet with any person, and particularly one of those who are considered to be great, represent to yourself what Socrates or Zeno would have done in such a case."

"What, then, is the fruit of these doctrines? It is the same as that of a vine: leaves, then a blossom, then a ripe cluster. So here, first an appearance, then an impulse, then an act. And the fruit is…"

"When you have said 'Tomorrow I will begin to attend,' you must be told that you are saying this: 'Today I will be shameless, disregardful of time and place, mean; it will be in the power of others to …"

"The world turns aside to let any man pass who knows where he is going."

"Do not be surprised if you are sometimes troubled by external things; for it is not the things themselves that trouble you, but your judgment about them."