This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...e, by the kind of entity it is. Many variations, many forms of adaptation to its background are possible to an organism, including the possibility of existing for a while in a crippled, disabled or diseased condition, but the fundamental alternative of its existence remains the same: if an organism fails in the basic functions required by its nature — if an amoeba’s protoplasm stop s assimilating food, or if a man’s heart stops beating — the organism dies. In a fundamental sense, stillness is the antithesis of life. Life can be kept in existence only by a constant proc...
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