This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...onsciousness are sufficient to guide an animal, but are not sufficient for man. Man’s actions and survival require the guidance of conceptual values derived from conceptual knowledge. But conc
eptual knowledge cannot be acquired automatically.
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A “ concept ” is a mental integration of two or more perceptual concretes, which are isolated by a process of abstraction and
united by means of a specific definition. Every word of man’s language, with the exception of proper names, denotes a concept, an abstraction that stands for an unlimited number of concretes ...