Only well-written works will descend to posterity. Fulness of knowledge, interesting facts, even useful inventions, are no pledge of immortality, for they may be employed by more skilful hands; they are outside the man; the style is the man himself.

One can descend by imperceptible degree from the most perfect creature to the most shapeless matter, from the best-organised animal to the roughest mineral.

There is nothing good in love but the physical part.

The dog has no ambition, no self-interest, no desire for vengeance, no fear other than that of displeasing.

To be and to think are one and the same for us.

He [man] abuses equally other animals and his own species, the rest of whom live in famine, languish in misery, and work only to satisfy the immoderate appetite and the still more insatiable vanity of this human being who, destroying others by want, destroys himself by excess.

The cat is the only animal which accepts the comforts but rejects the bondage of domesticity.