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

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

In the great drama of existence we are audience and actors at the same time.

When asked ... [about] an underlying quantum world, Bohr would answer, 'There is no quantum world. There is only an abstract quantum physical description. It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about Nature.'

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.

The measurement we get when we measure something is not a property of the thing measured.

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