One can mistrust one's own senses, but not one's own belief.

If a person tells me he has been to the worst places I have no reason to judge him; but if he tells me it was his superior wisdom that enabled him to go there, then I know he is a fraud.

Everything that can be thought at all can be thought clearly. Everything that can be said can be said clearly. Ludwig Wittgenstein

It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.

Propositions show what they say: tautologies and contradictions show that they say nothing.

The classifications made by philosophers and psychologists are like trying to classify clouds by their shape.

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.