This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

It is my belief that the problem of bringing peace to the world on a supranational basis will be solved only by employing Gandhi's method on a larger scale.

The scientist finds his reward in what Henri Poincare calls the joy of comprehension, and not in the possibility of application to which any discovery may lead.

No fairer destiny could be allotted to any physical theory than that it should of itself point out the way to the introduction of a more comprehensive theory, in which it lives on as a limiting case.

The only rational way of educating is to be an example. If one can't help it, a warning example.

Marie Curie is, of all celebrated beings, the only one whom fame has not corrupted.

My scientific work is motivated by an irresistible longing to understand the secrets of nature not by other feelings.