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

A man will be imprisoned in a room with a door that's unlocked and opens inwards; as long as it does not occur to him to pull rather than push.

We feel that even if all possible scientific questions be answered, the problems of life have still not been touched at all.

People nowadays think that scientists exist to instruct them, poets, musicians, etc. to give them pleasure. The idea that these have something to teach them - that does not occur to them.

If a lion could talk, we could not understand him.

A right-hand glove could be put on the left hand if it could be turned round in four-dimensional space.