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Wherever there is distinction, there was not such a situation regarding the established and widely accepted texts on the subject of ultimate knowledge (tattvajñāna) in various sects as described above. For example, take the established Brahmasūtra text in Vedic philosophy. The author himself, who is also the commentator, did not have the variations in words, options of meanings, ambiguities of meaning, and discrepancies in the text that we see today in its parts. Similarly, the author of the Tattvārthasūtra, who wrote the Sarvārthasiddhi, "Rajavārttika," and "Śleikavārttika," among others, did not have such variations in meanings, confusions in words, ambiguities in meanings, and discrepancies in the texts that we see today. This matter can certainly be understood properly by examining texts that have a single original and commentary. This much discussion brings us to the firm premise of the belief that the original text and its commentary are by the same person. That they are indeed the same author is exemplified by:
1. For example, see Sarvārthasiddhi – “var ruti vā. pāṭha” – 2, rū or chāsha nine na santīti vīroṣ paṇīraḥ soparāṇuṃ sūtrām – 6, 11 and “sin kena siddhiḥ? avedatvena tribhyo vā vedebhyaḥ siddhirbhāvato na dravyataḥ, dravyataḥ puṁliṅgenaiva athavā nimr̥nthaliṅgen saśr̥nthalinena vā siddhirbhūtapūrvanayāpekhṣa” – 10, 1.
2. The available Sanskrit texts also provide the first example of where the original author has written a commentary on the original sutra.