Meditations 8.14

Whatever man thou meetest with, immediately say to thyself: What opinions has this man about good and bad? For if with respect to pleasure and pain and the causes of each, and with respect to fame and ignominy, death and life, he has such and such opinions, it will seem nothing wonderful or strange to me if he does such and such things; and I shall bear in mind that he is compelled to do so.

Marcus Aurelius, Meditations 8.14, translated by George Long

Whatever man thou meetest, put to thyself at once this question: What are this man's convictions about good and evil? For if they are such and such about pleasure and pain and what is productive of them, about good report and ill report, about death and life, it will be in no way strange or surprising to me if he does such and such things. So I will remember that he is constrained to act as he does.

Marcus Aurelius, Meditations 8.14, translated by C. R. Haines