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

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

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

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

Let us award a just, a brilliant homage to those rare men whom nature has endowed with the precious privilege of arranging a thousand isolated facts, of making seductive theories spring from them; but let us not forget to state, that the scythe of the reaper had cut the stalks before one had thought of uniting them into sheaves!

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.

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