If you cannot measure it, then it is not science.

When you cannot measure, your knowledge is meager and unsatisfactory.

Questions of personal priority, however interesting they may be to the persons concerned, sink into insignificance in the prospect of any gain of deeper insight into the secrets of nature.

[Referring to Fourier's mathematical theory of the conduction of heat] ... Fourier's great mathematical poem.

Suppose that you could mark the molecules in a glass of water; then pour the contents of the glass into the ocean and stir the latter throughly so as to distribute the marked molecules uniformly throughout the seven seas; if then you took a glass of water anywhere out of the ocean, you would find in it about a hundred of your marked molecules.

We only know God in His works, but we are forced by science to admit and to believe with absolute confidence in a Directive Power-in an influence other than physical, or dynamical, or electrical forces.

The more thoroughly I conduct scientific research, the more I believe that science excludes atheism.