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In the case of complex personalities the matter stands thus: one of these can understand other men better than they can understand themselves, because within himself he has not only the character he is grasping, but also its opposite. Duality is necessary for observation and comprehension.

— Otto Weininger Sex and Character (1903)

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More quotes by Otto Weininger

If man were not free, then he could not conceive of causality at all, and could not form any concept of it. Insight into lawfulness is already freedom from it.

Memory, then, is a necessary part of the logical faculty. … The proposition A = A must have a psychological relation to time, otherwise it would be At1 = At2.

Sex and Character (1903)

Woman, in short, has an unconscious life, man a conscious life, and the genius the most conscious life.

Sex and Character (1903)

Not only virtue, but also insight, not only sanctity but also wisdom, are the duties and tasks of mankind.

Sex and Character (1903)

The deepest, the intelligible, part of the nature of man is that part which does not take refuge in causality, but which chooses in freedom the good or the bad.

Sex and Character (1903)

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Quote text and notes from Wikiquote: Otto Weininger (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.