Black seems to make a colour cloudy, but darkness doesn't. A ruby could thus keep getting darker without ever becoming cloudy; but if it became blackish red, it would become cloudy.

Elementary propositions consist of names.

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.

Logic takes care of itself; all we have to do is to look and see how it does it.

One of the most misleading representational techniques in our language is the use of the word 'I.'

This is how philosophers should salute each other: ‘Take your time.

If in life we are surrounded by death, so too in the health of our intellect by madness.