As A Physician Does His Patient

A physician is not angry at the intemperance of a mad patient; nor does he take it ill to be railed at by a man in a fever. Just so should a wise man treat all mankind, as a physician does his patient, and look upon them only as sick and extravagant.

-- Lucius Annaeus Seneca (The Younger, BCE 3 - 65 CE), Roman philosopher, Morals, Chapter VIII