Ludwig Wittgenstein

"A sign is made an object of use."

"Names are like tools; they serve a function."

"We cannot think what we cannot think; so what we cannot think we cannot say either."

"The solution of the problem of life is seen in the vanishing of the problem."

"The child learns this language game by practice and by being corrected."

"That whereof we cannot speak must we pass over in silence."

"It is impossible to say something and hold it to be false."

"Propositions can only say what is the case, nothing more."

"I want to say that whatever I see could be otherwise."

"The world is all that is the case."

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

"Mysticism is not how the world is, but that it is."

"The facts all contribute only something to the setting of the problem, not to its solution."

"If a man could not speak, he would not be a man."

"Everything that happens is an accident of the world."

"The good is beyond all propositions."

"We are bewitched by language."

"Knowledge is a form of seeing."

"The elementary propositions are independent of one another."

"Language disguises thought."

"The world is the totality of facts, not things."

"A new word is like a fresh tool in a toolbox."

"We find certain things about seeing puzzling, because we do not find the whole business of seeing puzzling enough."

"Every sign is capable of being the sign of any object."

"One does not use language to state falsehoods in the way one uses a tool."

"What is it that has meaning? Only sentences have meaning; only in the stream of life do words have meaning."

"The picture is applied to reality like a measure."

"What can be shown cannot be said."

"Identity is not a relation between objects."

"In mathematics we are not discovering pre-existing truths, we are creating them."