Marcus Aurelius
Meditations 8.1
This reflection also tends to the removal of the desire of empty fame, that it is no longer in thy power to have lived the whole of thy life, or at least thy life from thy youth upwards, like a philosopher; but both to many others and to thyself it is plain that thou art far from philosophy. Thou hast fallen into disorder then, so that it is no longer easy for thee to get the reputation of a philosopher; and thy plan of life also opposes it. If then thou hast truly seen where the matter lies, throw away the thought, How thou shall seem [to others], and be content if thou shalt live the rest of thy life in such wise as thy nature wills. Observe then what it wills, and let nothing else distract thee; for thou hast had experience of many wanderings without having found happiness anywhere,—not in syllogisms, nor in wealth, nor in reputation, nor in enjoyment, nor anywhere. Where is it then? In doing what man's nature requires. How then shall a man do this? If he has principles from which come his affects and his acts. What principles? Those which relate to good and bad: the belief that there is nothing good for man which does not make him just, temperate, manly, free; and that there is nothing bad which does not do the contrary to what has been mentioned.
Marcus Aurelius, Meditations 8.1, translated by George Long
This too serves as a corrective to vain-gloriousness, that thou art no longer able to have lived thy life wholly, or even from thy youth up, as a philosopher. Thou canst clearly perceive, and many others can see it too, that thou art far from Philosophy. So then thy life is a chaos, and no longer is it easy for thee to win the credit of being a philosopher; and the facts of thy life too war against it. If then thine eyes have verily seen where the truth lies, care no more what men shall think of thee, but be content if the rest of thy life, whether long or short, be lived as thy nature wills. Make sure then what that will is, and let nothing else draw thee aside. For past experience tells thee in how much thou hast gone astray, nor anywhere lighted upon the true life; no, not in the subtleties of logic, or in wealth or fame or enjoyment, or anywhere. Where then is it to be found? In doing that which is the quest of man's nature. How then shall a man do this? By having axioms as the source of his impulses and actions. What axioms? On the nature of Good and Evil, shewing that nothing is for a man's good save what makes him just, temperate, manly, free; nor any thing for his ill that makes him not the reverse of these.
Marcus Aurelius, Meditations 8.1, translated by C. R. Haines