Meditations by Marcus Aurelius Book 5 Page 25

XVII. After one consideration, man is nearest unto us; as we are bound to do them good, and to bear with them. But as he may oppose any of our true proper actions, so man is unto me but as a thing indifferent: even as the sun, or the wind, or some wild beast. By some of these it may be, that some operation or other of mine, may be hindered; however, of my mind and resolution itself, there can be no let or impediment, by reason of that ordinary constant both exception (or reservation wherewith it inclineth) and ready conversion of objects; from that which may not be, to that which may be, which in the prosecution of its inclinations, as occasion serves, it doth observe.

For by these the mind doth turn and convert any impediment whatsoever, to be her aim and purpose. So that what before was the impediment, is now