Uttaratantra - The Ultimate Continuum, or Gyü Lama, is often used as a short title in the Tibetan tradition for the key source text of buddha-nature teachings called the Ratnagotravibhāga of Maitreya/Asaṅga, also known as the Mahāyānottaratantraśāstra. Skt. उत्तरतन्त्र Tib. རྒྱུད་བླ་མ་ Ch. 寶性論
These are the root verses of the Uttaratantra attributed to Maitreya by the Tibetan tradition.
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