What I possess I would gladly retain. Change amuses the mind, yet scarcely profits.

Should I not be proud, when for twenty years I have had to admit to myself that the great Newton and all the mathematicians and noble calculators along with him were involved in a decisive error with respect to the doctrine of color, and that I among millions was the only one who knew what was right in this great subject of nature?

The greatest joy of a thinking man is to have searched the explored and to quietly revere the unexplored.

To witness two lovers is a spectacle for the gods.

Let mental culture go on advancing, let the natural sciences progress in even greater extent and depth, and the human mind widen itself as much as it desires: beyond the elevation and moral culture of Christianity, as it shines forth in the Gospels, it will not go.

True happiness springs from moderation.

Rash combat oft immortalizes man; if he should fall, he is renowned in song; but after-ages reckon not the ceaseless tears which the forsaken woman sheds. Poets tell us not of the many nights consumed in weeping, or of the dreary days wherein her anguished soul vainly yearns to call her loved one back.