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Dravyasamgraha
(possessed of infinite knowledge) is known as Ahārasamudghāta. In a certain stage, a Kevalī's form expands and fills up the whole universe, without leaving the original body. This is called Kevalī-samudghāta.
Ghoshal, Sarat Chandra, Dravya-Samgraha, p. 21-22
Kevali-samudghāta is expansion of the spatial units of the omniscient soul from his body without wholly discarding the body, for the purpose of levelling down the duration of the other three non-destructive karmas to that of the age-karma, by filling up the entire universe and contracting back to the size of the body in eight instants, just prior to attaining liberation.
Jain, S.A., Reality, p. 102
Ācārya Kundkund's Pañcāstikāya-Sāra
जह पउमरायरयणं खित्तं खीरे पभासयदि खीरं । तह देही देहत्थो सदेहमत्तं पभासयदि ॥
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Just as the lotus-hued ruby when placed in a cup of milk imparts its lustre to the milk, so Ātmā residing in its own body imparts its lustre or intelligence to the whole body. Commentary - Atmā is in itself non-spatial hence it is not accurate to ask “Where does it reside in its body?” It pervades through the whole body. If it is located in any particular part of the body, the parts away from its residence will have to be somehow related to consciousness. The Jaina system avoids the whole difficulty by considering the soul to be completely pervading in its own body. This pervading is not to be interpreted as a sort of physical expansion. It is merely spiritual manifestation, still the relation of consciousness is intimate
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