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. It contains explanations of key Yogācāra concepts such as the basal-consciousness (ālaya-vijñāna), the doctrine of appearance-only (vijñapti-mātra) and the "three own natures" (trisvabhāva). Étienne Lamotte considered this sutra "the link between the Prajñaparamita literature and the Yogācāra Vijñanavada school".