Otto Weininger - Logical Quotes

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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.

Otto Weininger

The logical axioms are the principle of all truth. These posit an existence towards which all cognition serves. Logic is a law which must be obeyed, and man realises himself only in so far as he is logical. He finds himself in cognition. All error must be felt to be crime. And so man must not err. He must find the truth.

Otto Weininger