This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...ganisms, from the simplest to the most complex — from the nutritive function in the single cell of an amoeba to the blood circulation in the body of a man — are actions generated by the orga
nism itself and directed to a single goal: the maintenance of the organism’s life.
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An organism’s life depends on two factors: the material or fuel which it needs from the outsi
de, from its physical background, and the action of its own body, the action of using that fuel properly. What standard determines what is proper in this context? The standard is the organism’...