The frank realisation that physical science is concerned with a world of shadows is one of the most significant of recent advances. - Arthur Eddington

If in a community of the blind one man suddenly received the gift of sight, he would have much to tell which would not be at all scientific.

When we encounter unexpected obstacles in finding out something which we wish to know, there are two possible courses to take. It may be that the right course is to treat the obstacle as a spur to further efforts; but there is a second possibility - that we have been trying to find something which does not exist. You will remember that that was how the relativity theory accounted for the apparent concealment of our velocity through the aether.

The mind-stuff of the world is, of course, something more general than our individual conscious minds.... It is difficult for the matter-of-fact physicist to accept the view that the substratum of everything is of mental character. But no one can deny that mind is the first and most direct thing in our experience, and all else is remote inference.