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A creature that cannot grasp the mutual exclusiveness of A and not A has no difficulty in lying; more than that, such a creature has not even any consciousness of lying, being without a standard of truth.

Otto Weininger (1906). “Sex & Character”, p.150, Рипол Классик
A creature that cannot grasp the mutual exclusiveness of A and not A has no difficulty in lying; more than that, such a creature has not even any consciousness of lying, being without a standard of truth.