In the presence of a good man, think all the time how you may learn to equal him. In the presence of a bad man, turn your gaze within.
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Confucius. The Analects. 6th century B. C., bk. 4, ch. 17.
Confucius. The Analects [Lunyu]. Translated by Annping Chin. Penguin, 2014, bk. 4, ch. 17.