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Colour-blindness always extends to the complementary colours. Those who are red blind are also green blind; those who are blind to blue have no consciousness of yellow. This law holds good for all mental phenomena; it is a fundamental condition of consciousness.

— 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.