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

"What can be said at all can be said clearly, and what we cannot talk about we must pass over in silence."

"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."

"The real discovery is the one that makes me capable of stopping doing philosophy when I want to. The one that gives philosophy peace, so that it is no longer tormented by questions which bring itself …"

"The philosopher must not be a specialist."