Procreation is nature's principal occupation, and every man, whether he be young or old, when meeting every woman measures the potentiality of sex between them.

Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.

The body of the earth is of the nature of a fish, a grampus or sperm whale, because it draws water as its breath instead of air.

Nature will not be admired by proxy.

One of the first conditions of happiness is that the link between Man and Nature shall not be broken.

Nature knows no indecencies; man invents them.