„What a marvelous cooperative arrangement – plants and animals each inhaling each other’s exhalations, a kind of planet-wide mutual mouth-to-stoma resuscitation, the entire elegant cycle powered by a star 150 million kilometers away.“

— Carl Sagan

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„The power which causes the several portions of the plant to help each other, we call life. Much more is this so in an animal. We may take away the branch of a tree without much harm to it; but not the animal's limb. Thus, intensity of life is also intensity of helpfulness — completeness of depending of each part on all the rest. The ceasing of this help is what we call corruption; and in proportion to the perfectness of the help, is the dreadfulness of the loss. The more intense the life has been, the more terrible is its corruption.“
— John Ruskin
„From which stars have we fallen to meet each other here?“
— Friedrich Nietzsche
„Observe the movements of the stars as if you were running their courses with them, and let your mind constantly dwell on the changes of the elements into each other. Such imaginings wash away the filth of life on the ground.“
— Marcus Aurelius