Meditations by Marcus Aurelius Book 12 Page 20

high conceited, is of all kind of pride and presumption, the most intolerable.

XXI. To them that ask thee, Where hast thou seen the Gods, or how knowest thou certainly that there be Gods, that thou art so devout in their worship? I answer first of all, that even to the very eye, they are in some manner visible and apparent. Secondly, neither have I ever seen mine own soul, and yet I respect and honour it. So then for the Gods, by the daily experience that I have of their power and providence towards myself and others, I know certainly that they are, and therefore worship them.

XXII. Herein doth consist happiness of life, for a man to know thoroughly the true nature of everything; what is the matter, and what is the form of it: with all his heart and soul, ever to do that which is just, and to speak the truth.