 Sandhinirmocana Sutra

The Ārya-saṃdhi-nirmocana-sūtra (Sanskrit; ; "Gongpa Ngédrel") or Noble sūtra of the Explanation of the Profound Secrets is a Mahāyāna Buddhist text and the most important sutra of the Yogācāra school.It contains explanations of key Yogācāra concepts such as the basis-consciousness ("ālaya-vijñāna"), and the doctrine of cognition-only ("vijñapti-mātra") and the "three natures" ("trisvabhāva").