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Life does more than adapt to the Earth. It changes the Earth to its own purposes.

Earth as an ecosystem stands out in the all of the universe. There's no place that we know about that can support life as we know it, not even our sister planet, Mars, where we might set up housekeeping someday, but at great effort and trouble we have to recreate the things we take for granted here.

It is only of life on Earth, however, that one can speak with any certainty. It seems to me that all life on Earth, the sum total of life upon the Earth, has purpose.

Life comes from the earth and life returns to the earth.

But this is life on earth, you can't have everything.

Life on earth is more like a verb. It repairs, maintains, re-creates, and outdoes itself.

The Earth does not belong to us: we belong to the Earth.

The earth and its resources belong of right to its people.

Life is a force in its own right. It is a new element. And it has altered the Earth. It covers Earth like a skin.

The earth is yet the place of the domicile of man and all the offspring of the first man.