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.

A man who keeps company with glaciers comes to feel tolerably insignificant by and by.

We behold the face of nature bright with gladness.

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.

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