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Proof

Upon the whole we must not judge of one another by their best actions; since the worst men do some good, and all men make fine professions: but we must judge of men by the whole of their conduct, and the effects of it. Thorough honesty requires great and long proof, since many a man, long thought honest, has at length proved a knave. And it is judging without proof, or false proof, that mankind continue unhappy. - Benjamin Franklin.