Meditations 6.41

Whatever of the things which are not within thy power thou shalt suppose to be good for thee or evil, it must of necessity be that, if such a bad thing befall thee, or the loss of such a good thing, thou wilt not blame the gods, and hate men too, those who are the cause of the misfortune or the loss, or those who are suspected of being likely to be the cause; and indeed we do much injustice because we make a difference between these things [because we do not regard these things as indifferent]. But if we judge only those things which are in our power to be good or bad, there remains no reason either for finding fault with God or standing in a hostile attitude to man.

Marcus Aurelius, Meditations 6.41, translated by George Long

If thou regardest anything not in thine own choice as good or evil for thyself, it is inevitable that, on the incidence of such an evil or the miscarriage of such a good, thou shouldst upbraid the Gods, aye, and hate men as the actual or supposed cause of the one or the other; and in fact many are the wrongdoings we commit by setting a value on such things. But if we discriminate as good and evil only the things in our power, there is no occasion left for accusing the Gods or taking the stand of an enemy towards men.

Marcus Aurelius, Meditations 6.41, translated by C. R. Haines