Where there is most feeling, there is the greatest martyrdom.

The men of experiment are like the ant; they only collect and use. But the bee...gathers its materials from the flowers of the garden and of the field, but transforms and digests it by a power of its own.

Necessity is a guardian in Nature.

The eye - which sees all objects reversed - retains the images for some time.

Patience serves as a protection against wrongs as clothes do against cold.

Though I may not . . . be able to quote other authors, I shall rely on that which is much greater and more worthy - on experience.

I am not poor. Poor are those who desire many things.