Meditation 10.11
11. Acquire a methodical insight into the way all things change, one into another; attend continually to this part of Nature and exercise yourself in it, for nothing is so likely to promote an elevation of mind. He has put off the body and, reflecting that he will be bound almost at once to leave all these things behind and to depart from men, he has devoted his whole self to justice in what is being accomplished by himself, and to Universal Nature in what comes to pass otherwise. And he spends no thought about what some one may say or think about him or do against him, but is contented with these two things, if he is himself acting justly in what is done in the present, and if he embraces what is assigned to him in the present; and he has put away every preoccupation and enthusiasm, and has no other will than to pursue a straight path according to the law and, pursuing it, to follow in God's train.