Euler calculated without effort, just as men breathe, as eagles sustain themselves in the air.

On certain occasions, the eyes of the mind can supply the want of the most powerful telescopes, and lead to astronomical discoveries of the highest importance.

Where should be be if we set ourselves to deny everything we do not know how to explain?

In the experimental sciences, the epochs of the most brilliant progress are almost always separated by long intervals of almost absolute repose.

A time will come when the science of destruction shall bend before the arts of peace when the genius which multiplies our powers, which creates new products, which diffuses comfort and happiness among the great mass of the people, shall occupy in the general estimation of mankind that rank which reason and common sense now assign to it.

Such is the privilege of genius it perceives, it seizes relations where vulgar eyes see only isolated facts.

To get to know, to discover, to publish-this is the destiny of a scientist.