Ask yourself whether our language is complete--whether it was so before the symbolism of chemistry and the notation of the infinitesimal calculus were incorporated in it; for these are, so to speak, suburbs of our language. (And how many houses or streets does it take before a town begins to be a town?) Our language can be seen as an ancient city: a maze of little streets and squares, of old and new houses, and of houses with additions from various periods; and this surrounded by a multitude of new boroughs with straight regular streets and uniform houses.

The real discovery is the one which enables me to stop doing philosophy when I want to. The one that gives philosophy peace, so that it is no longer tormented by questions which bring itself into question.

Proof, one might say, does not merely shew that it is like this, but: how it is like this. It shows how 13+14 yield 27.

The problems are solved, not by giving new information, but by arranging what we have always known.

If there were a verb meaning "to believe falsely," it would not have any significant first person, present indicative.

What Copernicus really achieved was not the discovery of a true theory but of a fertile new point of view.

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