The quest of the absolute leads into the four-dimensional world.

Proof is an idol before which the mathematician tortures himself.

Whatever else there may be in our nature, responsibility toward truth is one of its attributes.

It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.

There was a time when we wanted to be told what an electron is. The question was never answered. No familiar conceptions can be woven around the electron; it belongs to the waiting list.

What is possible in the Cavendish Laboratory may not be too difficult in the sun.

Who will observe the observers?