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

One can mistrust one's own senses, but not one's own belief.

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 him: 'This fellow isn’t insane. We are only doing philosophy.

Philosophy, as we use the word, is a fight against the fascination which forms of expression exert upon us.

We are asleep. Our Life is a dream. But we wake up sometimes, just enough to know that we are dreaming.

Every sign by itself seems dead. What gives it life?--In use it is alive. Is life breathed into it there?--Or is the use its life?

Where our language suggests a body and there is none: there, we should like to say, is a spirit.