It is possible--indeed possible even according to the old conception of logic--to give in advance a description of all 'true' logical propositions. Hence there can never be surprises in logic.
Ludwig WittgensteinLogic must look after itself. In a certain sense, we cannot make mistakes in logic.
Ludwig WittgensteinThis procedure [selecting the simplest law], however, has no logical justification but only a psychological one.
Ludwig WittgensteinPhilosophy aims at the logical clarification of thoughts. Philosophy is not a body of doctrine but an activity. A philosophical work consists essentially of elucidations.
Ludwig Wittgenstein'Imagine a person whose memory could not retain what the word 'pain' meant-so that he constantly called different things by that name-but nevertheless used the word in a way fitting in with the usual symptoms and presuppositions of pain'-in short he uses it as we all do. Here I should like to say: a wheel that can be turned though nothing else moves with it, is not part of the mechanism.
Ludwig Wittgenstein