See that the imagination of nature is far, far greater than the imagination of man.

I think nature's imagination Is so much greater than man's, she's never going to let us relax

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

Our imagination is stretched to the utmost, not, as in fiction, to imagine things which are not really there, but just to comprehend those things which 'are' there.

Each piece, or part, of the whole of nature is always merely an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation because we know that we do not know all the laws as yet.

Gravitation is, so far, not understandable in terms of other phenomena.