Writing well is at one and the same time good thinking, good feeling, and good expression; it is having wit, soul, and taste, all together.

The discoveries that one can make with the microscope amount to very little, for one sees with the mind's eye and without the microscope the real existence of all these little beings.

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.

Style supposes the reunion and the exercise of all the intellectual faculties. The style is the man.

We can only penetrate the rind of the earth.

In Ireland, there are the same fossils, the same shells and the same sea bodies, as appear in America, and some of them are found in no other part of Europe.

There is nothing good in love but the physical part.