Aurelius on "γνῶθι σεαυτόν."

"Nothing is more wretched than a man who traverses everything in a round, and pries into the things beneath the earth, as the poet says, and seeks by conjecture what is in the minds of his neighbours, without perceiving that it is sufficient to attend to the dæmon within him, and to reverence it sincerely. And reverence of the dæmon consists in keeping it pure from passion and thoughtlessness, and dissatisfaction with what comes from gods and men. For the things from the gods merit veneration for their excellence; and the things from men should be dear to us by reason of kinship; and sometimes even, in a manner, they move our pity by reason of men's ignorance of good and bad; this defect being not less than that which deprives us of the power of distinguishing things that are white and black." *

Emperor Marcus Aurelius Antoninus Augustus
Lived A.D. 121 - 180
Reigned A.D. 161-180
Meditations [properly translated as 'To Himself'],
Book II., Para. 13, trans. by Mr. G. Long.

Available via M.I.T. Internet Classics.

* The Greek to be added soon (target before end 2007).