Meditations 8.52

He who does not know what the world is, does not know where he is. And he who does not know for what purpose the world exists, does not know who he is, nor what the world is. But he who has failed in any one of these things could not even say for what purpose he exists himself. What then dost thou think of him who [avoids or] seeks the praise of those who applaud, of men who know not either where they are or who they are?

Marcus Aurelius, Meditations 8.52, translated by George Long

He that knoweth not what the Universe is knoweth not where he is. He that knoweth not the end of its being knoweth not who he is or what the Universe is. But he that is wanting in the knowledge of any of these things could not tell what is the end of his own being. What then must we think of those that court or eschew the verdict of the clappers, who have no conception where or who they are?

Marcus Aurelius, Meditations 8.52, translated by C. R. Haines