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I am sitting with a philosopher in the garden; he says again and again "I know that that's a tree", pointing to a tree that is near us. Someone else arrives and hears this, and I tell them: "This fellow isn't insane. We are only doing philosophy."

— Ludwig Wittgenstein On Certainty (1969)

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More quotes by Ludwig Wittgenstein

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

Culture and Value (1980)

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

Culture and Value (1980)

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

Culture and Value (1980)

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.

Culture and Value (1980)

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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.