It is harder to crack prejudice than an atom.

The mind that opens to a new idea never returns to its original size

No scientist thinks in formulae.

The special theory of relativity owes its origins to Maxwell's equations of the electromagnetic field.

Although I have been prevented by outward circumstances from observing a strictly vegetarian diet, I have long been an adherent to the cause in principle. Besides agreeing with the aims of vegetarianism for aesthetic and moral reasons, it is my view that a vegetarian manner of living by its purely physical effect on the human temperament would most beneficially influence the lot of mankind.

Every reminiscence is colored by the way things are today, and therefore by a delusive point of view.

You cannot prepare for war and peace at the same time.