Discourses, "About Cynicism" (§2)

“In the first place, in the things which relate to yourself, you must not be in any respect like what you do now; you must not blame God or man; you must take away desire altogether, you must transfer avoidance only to the things which are within the power of the will; you must not feel anger nor resentment or envy nor pity; a girl must not appear handsome to you, nor must you love a little reputation, nor be pleased with a boy or a cake. For you ought to know that the rest of men throw walls around them and houses and darkness when they do any such things, and they have many means of concealment.”