Letter 76 — On Learning Wisdom in Old Age (§22)

“If, however, you accept the view that there is anything good besides that which is honourable, all the virtues will suffer. For it will never be possible for any virtue to be won and held, if there is anything outside itself which virtue must take into consideration. If there is any such thing, then it is at variance with reason, from which the virtues spring, and with truth also, which cannot exist without reason. Any opinion, however, which is at variance with truth, is wrong.”