Marcus Aurelius
Meditations 3.6
If thou findest in human life anything better than justice, truth, temperance, fortitude, and, in a word, anything better than thy own mind's self-satisfaction in the things which it enables thee to do according to right reason, and in the condition that is assigned to thee without thy own choice; if, I say, thou seest anything better than this, turn to it with all thy soul, and enjoy that which thou hast found to be the best. But if nothing appears to be better than the Deity which is planted in thee, which has subjected to itself all thy appetites, and carefully examines all the impressions, and, as Socrates said, has detached itself from the persuasions of sense, and has submitted itself to the gods, and cares for mankind; if thou findest everything else smaller and of less value than this, give place to nothing else, for if thou dost once diverge and incline to it, thou wilt no longer without distraction be able to give the preference to that good thing which is thy proper possession and thy own; for it is not right that anything of any other kind, such as praise from the many, or power, or enjoyment of pleasure, should come into competition with that which is rationally and politically [or, practically] good. All these things, even though they may seem to adapt themselves [to the better things] in a small degree, obtain the superiority all at once, and carry us away. But do thou, I say, simply and freely choose the better, and hold to it.—But that which is useful is the better.—Well, then, if it is useful to thee as a rational being, keep to it; but if it is only useful to thee as an animal, say so, and maintain thy judgment without arrogance: only take care that thou makest the inquiry by a sure method.
Marcus Aurelius, Meditations 3.6, translated by George Long
If indeed thou findest in the life of man a better thing than justice, than truth, than temperance, than manliness, and, in a word, than thy mind's satisfaction with itself in things wherein it shews thee acting according to the true dictates of reason, and with destiny in what is allotted thee apart from thy choice—if, I say, thou seest anything better than this, turn to it with all thy soul and take thy fill of the best, as thou findest it.
But if there appears nothing better than the very deity enthroned in thee, which has brought into subjection to itself all individual desires, which scrutinizes the thoughts, and, in the words of Socrates, has withdrawn itself from all the enticements of the senses, and brought itself into subjection to the Gods, and cherishes a fellow-feeling for men—if thou findest everything else pettier and of less account than this, give place to nought else, to which if thou art but once plucked aside, and incline thereto, never more shalt thou be able without distraction to give paramount honour to that good which is thine own peculiar heritage. For it is not right that any extraneous thing at all, such as the praise of the many, or office, or wealth, or indulgence in pleasure, should avail against that good which is identical with reason and a civic spirit. All these things, even if they seem for a little to fit smoothly into our lives, on a sudden overpower us and sweep us away.
But do thou, I say, simply and freely choose the better and hold fast to it. But that is the better which is to my interest. If it is to thy interest as a rational creature, hold that fast; but if as a mere animal, declare it boldly and maintain thy judgment without arrogance. Only see to it that thou hast made thy enquiry without error.
Marcus Aurelius, Meditations 3.6, translated by C. R. Haines