It is impossible to trap modern physics into predicting anything with perfect determinism because it deals with probabilities from the outset.

An ocean traveler has even more vividly the impression that the ocean is made of waves than that it is made of water.

When an investigator has developed a formula which gives a complete representation of the phenomena within a certain range, he may be prone to satisfaction. Would it not be wiser if he should say 'Foiled again! I can find out no more about Nature along this line.'

Asked in 1919 whether it was true that only three people in the world understood the theory of general relativity, [Eddington] allegedly replied: "Who's the third?"

The helium which we handle must have been put together at some time and some place. We do not argue with the critic who urges that the stars are not hot enough for this process; we tell him to go and find a hotter place.

Electrical force is defined as something which causes motion of electrical charge; an electrical charge is something which exerts electric force.

An electron is no more (and no less) hypothetical than a star. Nowadays we count electrons one by one in a Geiger counter, as we count the stars one by one on a photographic plate.