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Tattvārthasūtra
Each sense (indriya) is of two kinds.
The word 'vidha' means kinds. The five senses are of two kinds each. What are the two kinds? The two kinds are: the physical-sense (dravyendriya) and the psychical-sense (bhāvendriya).
The next sūtra describes the physical-sense (dravyendriya).
निर्वृत्त्युपकरणे द्रव्येन्द्रियम् ॥१७॥
[निर्वृत्ति उपकरणे ] निर्वृत्ति और उपकरण को [ द्रव्येन्द्रियम् ] द्रव्येन्द्रिय कहते हैं।
The physical-sense (dravendriya) consists of the formation of the organ - nirvrtti – and the instrument itself – upakaraṇa.
'Nirurtti' means formation. Who does the formation? The karmas. Formation is of two kinds, external (bāhya) and internal (ābhyantara). The spreading of a miniscule extent (one/innumerable part of utsedhāngulal) of the soul in the shape of the senses such as the eyes is the internal formation. The collection of the physical matter, owing to the fruition of name-karma (nāmakarma), in the particular shape in the space covered by the soul is external formation. That which assists this formation (nirvytti) is the instrument (upakaraṇa). The instrument (upakaraṇa) also is of two kinds, external (bāhya) and internal (ābhyantara). In case of the eye, the eyeball is the internal
1- utsedhāngula = lit. small finger in its breadth; eight barley seeds in diameter ('Trilokasāra', gāthā 18, p. 23)
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