From Sun Simiao's version of the Hippocratic Oath

If someone seeks help because of illness, or on the ground of another difficulty, a great physician should not pay attention to status, wealth, or age; neither should he question whether the particular person is attractive or unattractive, whether he is an enemy or a friend, whether he is Chinese or a foreigner, or finally, whether he is uneducated or educated. He should meet everyone on equal ground; he should always act as if he were thinking of himself.
— Sun Simiao, translation by Paul Unschuld