Meditations 5.20

In one respect man is the nearest thing to me, so far as I must do good to men and endure them. But so far as some men make themselves obstacles to my proper acts, man becomes to me one of the things which are indifferent, no less than the sun or wind or a wild beast. Now it is true that these may impede my action, but they are no impediments to my affects and disposition, which have the power of acting conditionally and changing: for the mind converts and changes every hindrance to its activity into an aid; and so that which is a hindrance is made a furtherance to an act; and that which is an obstacle on the road helps us on this road.

Marcus Aurelius, Meditations 5.20, translated by George Long

In one respect a man is of very close concern to us, in so far as we must do him good and forbear; but in so far as any stand in the way of those acts which concern us closely, then man becomes for me as much one of things indifferent as the sun, as the wind, as a wild-beast. Though a man may in some sort fetter my activity, yet on my own initiative and mental attitude no fetters can be put because of the power they possess of conditional action and of adaptation to circumstances. For everything that stands in the way of its activity is adapted and transmuted by the mind into a furtherance of it, and that which is a check on this action is converted into a help to it, and that which is a hindrance in our path goes but to make it easier.

Marcus Aurelius, Meditations 5.20, translated by C. R. Haines