The mathematics is not there till we put it there.
Arthur Eddington

Something unknown is doing we don't know what.
Arthur Eddington

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.
Arthur Eddington

Who will observe the observers?
Arthur Eddington

It is one thing for the human mind to extract from the phenomena of nature the laws which it has itself put into them; it may be a far harder thing to extract laws over which it has no control.
Arthur Eddington

Oh leave the Wise our measures to collate. One thing at least is certain, light has weight. One thing is certain and the rest debate. Light rays, when near the Sun, do not go straight.
Arthur Eddington

We often think that when we have completed our study of one we know all about two, because "two" is "one and one." We forget that we still have to make a study of "and."
Arthur Eddington