Originally posted by Divinus
mys·ti·cism
n.
1. a) Immediate consciousness of the transcendent or ultimate reality or God.
b) The experience of such communion as described by mystics.
2. A belief in the existence of realities beyond perceptual or intellectual apprehension that are central to being and directly accessible by subjective experience.
Source: The American Heritage Dictionary of the English Language, Fourth Edition
mysticism
\Mys"ti*cism\, n. [Cf. F. mysticisme.] 1. Obscurity of doctrine.
2. (Eccl. Hist.) The doctrine of the Mystics, who professed a pure, sublime, and wholly disinterested devotion, and maintained that they had direct intercourse with the divine Spirit, and aquired a knowledge of God and of spiritual things unattainable by the natural intellect, and such as can not be analyzed or explained.
3. (Philos.) The doctrine that the ultimate elements or principles of knowledge or belief are gained by an act or process akin to feeling or faith.
Source: Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc
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There is no one doctrine of mysticism, as it seems to be more of a personal experience for each mystic. The definitions above seem to sum it up pretty neatly - personal communion with the divine.
-Divinus [/B]