「It is a sign of a dull mind to dwell upon the cares of the body, to prolong exercise, eating, drinking, and other bodily functions. These things are to be done by the way; all your attention must be given to the mind.」
「Remember that it is not he who reviles you or strikes you, who insults you, but it is your opinion about these things as being insulting. When then a man irritates you, you must know that it is your own opinion which has irritated you.」
― エピクテトス『要録』第41章