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From the perspective of the Sutra Agama, the author of the Nisitha Sutra is Ganadhara. The first attainment of that Sutra was by the disciples of Ganadhara, and the traditional attainment was by the students of Ganadhara.
Thus, according to Acharya Jinadasagani Mahttar, the author of the Nisitha is the Tirthankara from the perspective of meaning, and Ganadhara from the perspective of the Sutra. Then, the question naturally arises as to how Bhadrabahu was considered the author of the Nisitha by the Panchakल्पणिकार. When we ponder deeply on this question, we find its solution in the Dashaśrutaskandhaniyukti. There, the Niyuktikar, while contemplating the Dashaśrutaskandha, has written that the present ten categories are smaller than the ten categories obtained in the Angapravesht Agamas. The elders (sthaviras) made these smaller categories for the benefit of the disciples. According to the Panchakल्पभाष्य चणि, those elders were Bhadrabahu. In short, we can say that the Tirthankara is the formulator of the meaning, Ganadhara is the author of the Sutra, and Bhadrabahu Swami is the creator of the present concise form.
At the end of the Nisitha Sutra, three verses are found in the praise (prasasti). Based on these, there is a belief among scholars that the author of the Nisitha is Vishakhacharaya. In all the available pattavalis of the Shvetambar tradition, there is no mention of Vishakhacharaya. In the pattavali of the Digambar tradition, the name of Vishakhacharaya is found after Bhadrabahu. Vishakhacharaya was a knower of the ten previous births. Bhadrabahu Swami lived for one hundred and sixty-two years after the nirvana of the Veer. Only after him did the era of Vishakhacharaya begin. In the praise verses, for Vishakhacharaya, "Tass Lihiyam Nisīham" - here, the meaning of "लिखित" can be both "author" and "writer". There is no mention of any other Vishakhacharaya in the pattavalis. When the name of Vishakhacharaya was clearly mentioned as the author of the Nisitha in the praise, why did the Chanikara write the Nisitha as being authored by Ganadhara, and why did Acharya Sheelank write the author of the Nisitha as being a knower of fourteen previous births? It is not possible to say anything definitively in response to this.
Another question arises: were these praise verses present before the Niyuktikar, the Bhashyakar, and the Churnikar? If it is assumed that the author of the Nisitha was Vishakhacharaya, then the second question is: did Vishakhacharaya compose the praise verses? From the study of the verses, it is clear that Vishakhacharaya himself could not introduce himself in this way; how could he praise his own qualities? If Vishakhacharaya had given these verses at the end of the main text, what objection could the Niyuktikar have had in mentioning Vishakhacharaya? Why would he then refer to him with the word "sthavir"? Therefore, it is clear that these three praise verses were not present before the Niyuktikar.
1. "Nisīhachuljhayaṇassa Tittthagaraṇam Athassa Attāgame, Gaṇaharaṇam Suttasssa Attāgame, Gaṇāṇam Athassa Aṇam
Tarāgame. Gaṇaharasisāṇam Suttasssa Aṇantarāgame, Athassa Paramparāgame. Teṇa Param Sesāṇam Suttasssa Vi Athassa Vi ṇo Attāgame, ṇo Aṇantarāgame, Paramparāgame."
- Nisitha Churni Part 1 Page 4
Dasanacharitajuo Jutto Guttisū Sajjanahīesu. Nāmena Visāhagani Mahttarō Guṇāṇ Manjūsā || Kīttīkati Piṇāddhō Jasapattō Paḍahō Tisāgar Niruddho. Puṇaruttam Bhamai Sahi Sasivva Gagaṇam Guṇam Tassa. || Tassa Lihiyam Nisīham Dhammadhurādharaṇapavar Pujjassa. Prārōggam Dhāraṇijja Sissapasissōva Bhojjam Cha. || - Nisitha Sutra Part 4 Page 395