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The Teravāthasūtra states that like the material substances, the living substance (jīva) is also formless. After that, why does one dimension increase or decrease while the other does not? The answer to this question is nothing but inherent nature (svabhāva). The inherent nature of the living substance is such that it, upon receiving a cause, attains contraction and expansion like a lamp. Just as the light of a lamp placed in an open space has a certain dimension, but when it is placed in a container, its light becomes limited to the size of the container; when it is placed under a pot, it illuminates only the inside of the pot; when placed under an altar, it becomes restricted in light—similarly, the light substance (chhavadra vyavahār) is also contraction-expansion capable. Therefore, whenever it takes on a smaller or larger body, it undergoes contraction and expansion according to the dimensions of that body.
Here the question arises: if the living being, due to its contraction nature, is considered, then how can it fit into a smaller part of an infinite space, such as a region of the sky, or into one, two, four, five, etc., regions? Similarly, why does it not encompass the entire space like the complete expansion character of the space when it is its inherent nature to expand? The answer lies in the fact that the limitation of contraction is dependent on the karmic body. No karmic body can be smaller than an infinitesimally small part; therefore, the process of contraction of the living being is limited to that extent.