I have heard that whoever loves is in no condition old.

One single idea may have greater weight than all the men, animals, and machines for a century.

Who can . . . guess how much industry and providence and affection we have caught from the pantomime of brutes?

Let no one honour me with tears, or bury me with lamentation. Why? Because I fly hither and thither, living in the mouths of me.

If you are wise, you will dread a prosperity which only loads you with more.

Motion or change, and identity or rest, are the first and second secrets of nature: Motion and Rest. The whole code of her laws may be written on the thumbnail, or the signet of a ring.

No change of circumstances can repair a defect of character.