In order to know an object, I must know not its external but all its internal qualities. - Ludwig Wittgenstein

467. 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."

Tutto ciò che si può dire lo si può dire chiaramente. Su ciò di cui non si può parlare si deve tacere.

A picture held us captive. And we could not get outside it, for it lay in our language and language seemed to repeat it to us inexorably.