This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...ntity can have goals or can originate them. And it is only a living organism that has the capacity for self-generated, goal-directed action. On the physical level, the functions of all living or 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.

An organism’s life depends on two factors: the material or fuel which it needs from the outsi...
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