Adopt a systematic study of the way all things change into one another: pay constant attention to this aspect of nature and train yourself in it. Nothing is so conducive to the greatness of mind. One so trained has divested himself of his body: recognizing that in almost no time he will have to leave all this behind and depart from the world of men, he has devoted his entire self to justice in his own actions and to the nature of the Whole in all things external.
He does not even give a thought to what others will say or suppose about him, or do against him, but is content to meet these two conditions – his own integrity in each present action, and glad acceptance of his present lot. He has abandoned all other preoccupations and ambitions, and his only desire is to walk the straight path according to law and, in so doing, to follow in the path of god.
Meditation, Marcus Aurelius, 9:11