Man selects only for his own good: Nature only for that of the being which she tends.

Nature appears to have been the cruel stepmother rather than the mother of many animals.

Nature does not complete things. She is chaotic. Man must finish, and he does so by making a garden and building a wall.

Nature knows no indecencies; man invents them.

What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.