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.

Karl Marx

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

Karl Marx

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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.

Karl Marx

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

Robert Frost

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Nature knows no indecencies; man invents them.

Mark Twain

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I do not see why man should not be just as cruel as nature.

Adolf Hitler

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Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is grandeur in this view of life.