Of course I don't believe in it [pointing to horseshoe on his office wall]. But I understand that it brings you luck whether you believe in it or not.

We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.

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.

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

Oh what idiots we have all been, this is just as it must be

The meaning of life consists in the fact that it makes no sense to say that life has no meaning.