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The Ārya-saṃdhi-nirmocana-sūtra (Sanskrit) or Noble Sūtra of the Explanation of the Profound Secrets is a Mahāyāna Buddhist text and the most important sutra of the Yogācāra school.[1][2][3] It contains explanations of key Yogācāra concepts such as the basal-consciousness (ālayavijñāna), the doctrine of appearance-only (vijñaptimātra) and the "three own natures" (trisvabhāva). Étienne Lamotte considered this sutra "the link between the Prajñāpāramitā literature and the Yogācāra Vijñānavāda school".[4]
This sūtra was translated from Sanskrit into Chinese four times, the most complete and reliable of which is typically considered to be that of Xuanzang. It also was translated into Tibetan. The original Sanskrit text has not survived to the present day.