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A tautology's truth is certain, a proposition's possible, a contradiction's impossible. (Certain, possible, impossible: here we have the first indication of the scale that we need in the theory of probability.)

— Ludwig Wittgenstein Tractatus Logico-Philosophicus (1922)

Die Wahrheit der Tautologie ist gewiss, des Satzes möglich, der Kontradiktion unmöglich.

Original text (German)

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Don't for heaven's sake, be afraid of talking nonsense! But you must pay attention to your nonsense.

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Never stay up on the barren heights of cleverness, but come down into the green valleys of silliness.

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Man has to awaken to wonder — and so perhaps do peoples. Science is a way of sending him to sleep again.

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It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.

The way you use the word "God" does not show whom you mean — but, rather, what you mean.

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Quote text and notes from Wikiquote: Ludwig Wittgenstein (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.