Never express yourself more clearly than you are able to think.

When it comes to atoms, language can be used only as in poetry.

Some things are so serious, they can only be joked about.

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

When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it.

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.

Every valuable human being must be a radical and a rebel, for what he must aim at is to make things better than they are.