Khai Nguyen Buddhist temple

Per Wikipedia, the Śūraṅgama Sūtra (Sanskrit: शूरङ्गम सूत्र; traditional Chinese: 大佛頂首楞嚴經) (Taisho 945) is a Mahayana Buddhist sutra that has been especially influential in Chan Buddhism. The general doctrinal outlook of the Śūraṅgama Sūtra is that of esoteric Buddhism and Buddha-nature, with some influence from Yogacara. A common translation of the sutra's name in English is the "Heroic March sutra" (as used e.g. by Matthew Kapstein, Norman Waddell, and Andy Ferguson), or the "scripture of the Heroic Progress" (as used e.g. by Thomas Cleary). Some of the main themes of the Śūraṅgama Sūtra are the worthlessness of the Dharma when unaccompanied by samādhi power, and the importance of moral precepts as a foundation for the Buddhist practice. Also stressed is the theme of how one effectively combats delusions that may arise during meditation.