To write well is to think well, to feel well, and to render well; it is to possess at once intellect, soul, and taste.

Those who write as they speak, even though they speak well, write badly.

We can only penetrate the rind of the earth.

Man thinks, and at once becomes the master of the beings that do not think.

The style is the man himself.

I am convinced, by repeated observation, that marbles, lime-stones, chalks, marls, clays, sand, and almost all terrestrial substances, wherever situated, are full of shells and other spoils of the ocean.

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.