“What can be shown, cannot be said.”

“[Philosophy] must set limits to what can be thought; and, in doing so, to what cannot be thought. It must set limits to what cannot be thought by working outwards through what can be thought.”

“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.”

“Everything that can be thought at all can be thought clearly. Everything that can be said can be said clearly.”

“If anyone is unwilling to descend into himself, because this is too painful, he will remain superficial in his writing. . . If I perform to myself, then it’s this that the style expresses. And then the style cannot be my own. If you are unwilling to know what you are, your writing is a form of deceit.”

“Whereof one cannot speak, thereof one must be silent.”

“Concerning that which cannot be talked about, we should not say anything. ”