Where our language suggests a body and there is none: there, we should like to say, is a spirit.

Everything that can be said, can be said clearly.

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

With my full philosophical rucksack I can only climb slowly up the mountain of mathematics.

I sit astride life like a bad rider on a horse. I only owe it to the horse's good nature that I am not thrown off at this very moment.

To think that you are not following a rule is to follow a rule.

Only let's cut out the transcendental twaddle when the whole thing is as plain as a sock on the jaw.