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

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

The human body is the best picture of the human soul.

He who lives in the present lives in eternity.

What we cannot speak about we must pass over in silence.

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

The truth of the thoughts that are here set forth seems to me unassailable and definitive. I therefore believe myself to have found, on all essential points, the final solution of the problems. And if I am not mistaken in this belief, then the second thing in which the value of this work consists is that it shows how little is achieved when these problems are solved.