The truth of the thoughts that are here set forth seems to me unassailable and definitive. I therefore believe myself to have found, on all essential points, the final solution of the problems. And if I am not mistaken in this belief, then the second thing in which the value of this work consists is that it shows how little is achieved when these problems are solved.

Logic must look after itself. In a certain sense, we cannot make mistakes in logic.

We must do away with all explanation, and description alone must take its place.

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

Philosophy aims at the logical clarification of thoughts. Philosophy is not a body of doctrine but an activity. A philosophical work consists essentially of elucidations.

This sort of thing has got to be stopped. Bad philosophers are like slum landlords. It's my job to put them out of business.

You can't think decently if you're not willing to hurt yourself