Being willing is not enough. We must do.

It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.

Men wrongly lament the flight of time, blaming it for being too swift; they do not perceive that its passage is sufficiently long, but a good memory, which nature has given to us, causes things long past to seem present.

Who would believe that so small a space could contain the images of all the universe?

That which has no limitations, has no form.

The body of the earth is of the nature of a fish... because it draws water as its breath instead of air.

Instrumental or mechanical science is the noblest and above all others, the most useful.