Antahkarana (Sanskrit) [from antar interior, within + karana sense organ] Interior organ or instrument; defined variously as the seat of thought and feeling, the thinking faculty, the heart, mind, soul, and conscience. In Vedanta philosophy, it is looked upon as a fourfold inner instrument or intermediary between spirit and body, with mind being the go-between or bridge. One could say that there are several antahkaranas in the human septenary constitution: one for every path or bridge between any two monadic centers. Man is a unity in diversity, and the antahkaranas are the links of vibrating consciousness-substance uniting these various centers (cf OG 5). Blavatsky describes it as "the path that lies between thy Spirit and thy self, the highway of sensations, the rude arousers of Akankara" (the sense of egoity); and that when the two have merged into the One and the personal sacrificed to self impersonal, then the antahkarana vanishes because no longer useful as a functioning bridge between the two. Further, the antankarana is "the lower Manas, the Path of communication or communion between the personality and the higher Manas or human Soul. At death it is destroyed as a Path or medium of communication, and its remains survive in a form as the Kamarupa -- the 'shell' " (VS 56, 88-9).
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Antahkarana2"