This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
... the choice “to think or not” is the choice “to focus or not.” Existentially, the choice “to focus or not” is the choice “to be conscious or not.” Metaphysically, the choice “t
o be conscious or not” is the choice of life or death.
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Consciousness — for those living organisms which possess it — is the basic means of survival. For man, the basic means
of survival is reason. Man cannot survive, as animals do, by the guidance of mere percepts. A sensation of hunger will tell him that he needs food (if he has learned to identify it as “hunger�...