Anyone not shocked by quantum mechanics has not yet understood it.

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

It is, indeed, perhaps the greatest prospect of humanistic studies to contribute through an increasing knowledge of the history of cultural development to that gradual removal of prejudices which is the common aim of all science.

One thought spectra are marvellous, but it is not possible to make progress there. Just as if you have the wing of a butterfly then certainly it is very regular with the colors and so on, but nobody thought one could get the basis of biology from the coloring of the wing of a butterfly.

A deep truth is a truth so deep that not only is it true but it's exact opposite is also true.

If we couldn't laugh at ourselves, that would be the end of everything.

Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.