Science is bound, by the everlasting vow of honour, to face fearlessly every problem which can be fairly presented to it.

If you study science deep enough and long enough, it will force you to believe in God.

Nothing can be more fatal to progress than a too confident reliance on mathematical symbols; for the student is only too apt to take the easier course, and consider the formula not the fact as the physical reality.

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.

Fourier is a mathematical poem.

I have not the smallest molecule of faith in aerial navigation other than ballooning, or of the expectation of good results from any of the trials we heard of. So you will understand that I would not care to be a member of the Aeronautical Society.

When you can measure what you are speaking about, and express it in numbers, you know something about it.