Proof is the idol before whom the pure mathematician tortures himself. — Sir Arthur Eddington. British astrophysicist (1882–1944) Mathematics
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 have still to make of a study of 'and.'
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'.
Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers.
In Einstein's theory of relativity the observer is a man who sets out in quest of truth armed with a measuring-rod. In quantum theory he sets out with a sieve.