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

Leo Tolstoy

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We behold the face of nature bright with gladness.

Charles Darwin

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

Leonardo da Vinci

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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 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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Nature knows no indecencies; man invents them.

Mark Twain

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