Do not promote what you can't explain, simplify, and prove early.

Nothing is lost and nothing is created in the operations of art as those of nature.

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.'

These are the living springs of great thoughts and great actions. Everything grows clear in the reflections from the Infinite.

It would seem to me that I was committing a theft if I were to let one day go by without doing some work.

Chance favours the trained mind.

The greatest disorder of the mind is to let will direct it.