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

If we can't express what we know in the form of numbers, we really don't know much about it.

Although mechanical energy is indestructible, there is a universal tendency to its dissipation, which produces throughout the system a gradual augmentation and diffusion of heat, cessation of motion and exhaustion of the potential energy of the material Universe

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.

At what time does the dissipation of energy begin?

The atheistic idea is so nonsensical that I do not see how I can put it in words.

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