The vortex theory [of the atom] is only a dream. Itself unproven, it can prove nothing, and any speculations founded upon it are mere dreams about dreams.

All of science can be divided into physics and stamp-collecting.

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

Mathematics is the only good metaphysics.

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

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

Let nobody be afraid of true freedom of thought. Let us be free in thought and criticism; but, with freedom, we are bound to come to the conclusion that science is not antagonistic to religion, but a help to it.