And anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.

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

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.

Anybody who is not shocked by this subject has failed to understand it. [of quantum mechanics]

All rising curves that show unwelcome trends in human affairs will approach infinity if extended far enough, but it is we who dictate the curve and not vice versa.

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

Accuracy and clarity of statement are mutually exclusive.