Nature is man's inorganic body - that is to say, nature insofar as it is not the human body. Man lives from nature - i.e., nature is his body - and he must maintain a continuing dialogue with it is he is not to die. To say that man's physical and mental life is linked to nature simply means that nature is linked to itself, for man is a part of nature.

Consumption is also immediately production, just as in nature the consumption of the elements and chemical substances is the production of the plant.

Darwin has interested us in the history of nature's technology.

Just as the savage must wrestle with nature to satisfy his wants, to maintain and reproduce life, so must civilised man, and he must do so in all social formations and under all possible modes of production.

I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils.

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