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

A main cause of philosophical disease-an unbalanced diet: one nourishes one's thinking with only one kind of example.

For an answer which cannot be expressed the question too cannot be expressed. The riddle does not exist. If a question can be put at all, then it can also be answered.

Black seems to make a colour cloudy, but darkness doesn't. A ruby could thus keep getting darker without ever becoming cloudy; but if it became blackish red, it would become cloudy.

You learned the concept 'pain' when you learned language.

One often makes a remark and only later sees how true it is.

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.