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

Almost in the same way as earlier physicists are said to have found suddenly that they had too little mathematical understanding to be able to master physics; we may say that young people today are suddenly in the position that ordinary common sense no longer suffices to meet the strange demands life makes. Everything has become so intricate that for its mastery an exceptional degree of understanding is required. For it is not enough any longer to be able to play the game well; but the question is again and again: what sort of game is to be played now anyway?

Is it even always an advantage to replace an indistinct picture by a sharp one? Isn't the indistinct one often what we need?

That which cannot be said must not be said. That which cannot be said, one must be silent thereof.

I am not interested in constructing a building, so much as in having a perspicuous view of the foundations of possible buildings.

For remember that in general we don't use language according to strict rules-- it hasn't been taught to us by means of strict rules, either. We, in our discussions on the other hand, constantly compare language with a calculus preceding to exact rules.

We could present spatially an atomic fact which contradicted the laws of physics, but not one which contradicted the laws of geometry.