An entirely honest man, in the severe sense of the word, exists no more than an entirely dishonest knave; the best and the worst are only approximations to those qualities. Who are those that never contradict themselves? yet honesty never contradicts itself. Who are they that always contradict themselves? yet knavery is mere self-contradiction. Thus the knowledge of man determines not the things themselves, but their proportions, the quantum of congruities and incongruities.