Preconceived ideas are like searchlights which illumine the path of the experimenter and serve him as a guide to interrogate nature. They become a danger only if he transforms them into fixed ideas-this is why I should like to see these profound words inscribed on the threshold of all the temples of science: 'The greatest derangement of the mind is to believe in something because one wishes it to be so.'

There are no such things as applied sciences, only applications of science.

Science knows no country because it is the light that iluminates the world

Inspiration is the impact of a fact on a well-prepared mind

The more I study nature, the more I stand amazed at the work of the Creator. Science brings men nearer to God.

Analogy cannot serve as proof.

If science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.