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https://tibetan-translations.com/2018/12/22/the-sutra-of-golden-light-the-29-chapter-version-chapter-2-the-teaching-on-the-lifespan-of-the-tathagata/
The Sūtra of Golden Light: The 29 Chapter Version, Chapter 2 – The Teaching on the Lifespan of the Tathāgata