Epictetus

“ Bring disease, bring death, bring poverty, reviling, peril of life in court; all these things will become helpful at a touch from the magic wand of Hermes. "What will you make of death?" Why, what else but make it your glory, or an opportunity for you to show in deed thereby what sort of person a man is who follows the will of nature. ”

“ But what? They call knowledge good, and error evil; so that even in regard to what is false there arises a good, that is, the knowledge that the false is false. So it ought to be, then, also with our life. ”

“ That it is possible to derive advantage from everything external
In the case of our intellectual impressions practically all men have agreed that the good and the evil are in ourselves, and not in externals. Nobody calls the statement that it is day, good, or that it is night, bad, and the greatest of evils, the statement that three is four. ”