Ludwig Wittgenstein

My philosophy is not a system.

The meaning of life is not a problem that can be solved.

How can it be that philosophy, being a matter of thinking, is so arduous?

I am not interested in constructing a building, but in having a clear view of the foundations of possible buildings.

The philosopher is not a citizen of any community of ideas. That is what makes him a philosopher.

What is the use of studying philosophy if all that it does for you is to enable you to talk with some plausibility about some abstruse questions of logic, etc., and if it does not improve your thinking about the important questions of everyday life?

A serious and good philosophical work could be written consisting of nothing but jokes.

The greatest evil in the world is not the evil that you do, but the evil that you stand by and allow to be done.

If a lion could speak, we could not understand him.

My fundamental conception is that the 'logical constants' are not representatives; that there can be no representatives of the logic of facts.

Philosophy is not a theory but an activity.

Ethics and aesthetics are one.

The world is independent of my will.

The limit of empiricism is not the world, but the limit of my language.

What we cannot speak about we must pass over in silence.

The difficulty is not to find the solution but to recognize it.

Genius is not cleverness. Schopenhauer says: 'A man can be a genius without having produced anything at all.' And he is right. The genius is the one who has vision.

If people did not sometimes do silly things, nothing intelligent would ever get done.

My mind is not a repository for other people's garbage.

Skepticism is not irrefutable, but obviously nonsensical, when it tries to raise doubts where no question can be asked.