大般涅槃經義記 5.9

5.9

Question: If that is illness practice, why is it spoken of in the 'Brahmacaryā Practice Chapter'? Answer: A single chapter fully discussing many dharmas is common to all sūtras, and is nothing to wonder at. Another question: If it also discusses illness practice, why is it exclusively named the 'Brahmacaryā Practice Chapter'? Examples of this are also numerous; just as the 'Tathāgata-Nature Chapter' above fully explains many dharmas, yet the chapter title is exclusively named 'Tathāgata-Nature Chapter', this is also similar to that. The establishment of chapters in sūtras has various differences: some take their name from the beginning, some from the end, some based on the middle, and some according to their predominant characteristic; it cannot be fixed.