This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
... sensations, percepts, urges or “instincts” can do it; only a mind can.
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Such is the meaning of the definition: that which is required for man’s survival qua man. It does not
mean a momentary or a merely physical survival. It does not mean the momentary physical survival of a mindless brute, waiting for another brute to crush his skull. It does not mean the momentary
physical survival of a crawling aggregate of muscles who is willing to accept any terms, obey any thug and surrender any values, for the sake of what is known as “survival at any price,” wh...