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Tattvārthasūtra
(indra), it neither cognizes objects within a limited range nor remains for long (the mental attitude changes quickly). The mind is described as an internal sense. In investigating good and evil and in remembrance, etc., the mind is not dependent on the senses. Nor is the mind seen outwardly like the eyes, etc. So it is called the internal sense. What for is 'tad' - 'that' - used? 'That is used for denoting sensory knowledge (matijñāna). Now sensory knowledge has just been mentioned. It is argued that a rule or an exception refers to what has just been described. So this sūtra would refer to sensory knowledge only even without the word 'that'. The answer is, 'that' is intended to refer to this (previous) sūtra as well as the following sūtra. The knowledge that has synonyms like 'mati' is caused by the senses and the mind. And the same has four stages – impression (avagraha), inquisitiveness (īhā), comprehension (avāya) and retention (dhāraņā). If ‘that were not used, the synonyms such as 'mati' would refer to sensory knowledge, and the kind of knowledge caused by the senses and the mind, would refer to scriptural knowledge with the four stages mentioned in the next sūtra. Thus it would lead to a faulty inference.
The cause of sensory knowledge has been understood. Its stages are mentioned in the next sūtra.
अवग्रहेहावायधारणाः ॥१५॥
[ 310UE SET 31914 EROTT: ] 3 CUE, SET, 34ar4, site EURYTI - ये चार (उस मतिज्ञान के) भेद हैं।
Impression – avagraha, inquisitiveness – īhā, comprehension - avāya, and retention - dhāraṇā, are the four stages (of sensory knowledge (matijñāna)].
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