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

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.

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

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.

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

All the work of the crystallographers serves only to demonstrate that there is only variety everywhere where they suppose uniformity ... that in nature there is nothing absolute, nothing perfectly regular.

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