Do not imagine that mathematics is hard and crabbed, and repulsive to common sense. It is merely the etherealization of common sense.

You know only insofar as you can measure.

Fourier is a mathematical poem.

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

At what time does the dissipation of energy begin?

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.

To measure is to know.