No one can take from us the joy of the first becoming aware of something, the so-called discovery. But if we also demand the honor, it can be utterly spoiled for us, for we are usually not the first. What does discovery mean, and who can say that he has discovered this or that? After all it's pure idiocy to brag about priority; for it's simply unconscious conceit, not to admit frankly that one is a plagiarist.

If nature is your teacher, your soul will awaken.

To a valet no man is a hero.

With knowledge grows doubt.

To become aware in time when young of the advantages of age; to maintain the advantages of youth in old age: both are pure fortune.

Each ten years of a man's life has its own fortunes, its own hopes, its own desires.

Make the most of time, it flies away so fast; yet method will teach you to win time.