| | Essence is epistemological, not metaphysical. Things don't have essences; concepts have essences.
"Objectivism holds that the essence of a concept is that fundamental characteristics(s) of its units on which the greatest number of other characteristics depend, and which distinguishes these units from all other existents within the field of man's knowledge. Thus the essence of a concept is determined contextually and may be altered with the growth of man's knowledge. The metaphysical referent of man's concepts is not a special, separate metaphysical essence, but the total of the facts of reality he has observed, and this total determines which characteristics of a given group of existents he designates as essential. An essential characteristics is factual, in the sense that it does exist, does determine other characteristics and does distinguish a group of existents from all others; it is epistemological in the sense that the classification of "essential characteristic" is a device of man's method of cognition -- a means of classifying, condensing and integrating an ever-growing body of knowledge." (Rand, ITOE, p. 52)
For instance, the “essence” of the concept ‘bird’ for a child will be different than for an adult, because the child’s knowledge is not as great as the adult’s. For a very young child, the essence of a ‘bird’ might be “a thing that moves in the air.” This allows the child to distinguish birds from things on the ground. But once he discovers kites, the essence of a bird will change to “a thing that flies under its own power,” which allows the child to distinguish birds from kites. When he discovers airplanes, the essence of a bird will change again to “a living thing that has wings and can fly,” which allows him to distinguish a bird from a plane as well as from a kite. When he discovers flies and moths, the essence changes once more to “a warm-blooded vertebrate that has wings and flies,” which allows him to distinguish a bird from flying insects as well as from airplanes and kites. (Examples cited from Leonard Peikoff's course on Objectivist Epistemology)
Thus, essence can change with the growth of one's knowledge and is not a metaphysical aspect of an existent a la Aristotle.
- Bill (Edited by William Dwyer on 4/18, 6:13pm)
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