Consider the concepts referred to in the words 'where', 'when', 'why', 'being', to the elucidation of which innumerable volumes of philosophy have been devoted. We fare no better in our speculations than a fish which should strive to become clear as to what is water.

We cannot solve our problems with the same thinking we used when we created them.

The height of stupidity is most clearly demonstrated by the individual who ridicules something he knows nothing about.

I think that a particle must have a separate reality independent of the measurements. That is an electron has spin, location and so forth even when it is not being measured. I like to think that the moon is there even if I am not looking at it.

We can't solve today's problems with the mentality that created them.

I have not eaten enough of the tree of knowledge, though in my profession I am obligated to feed on it regularly.

The only source of knowledge is experience.