Vajrasekhara Sutra

The Vajrasekhara Sutra is an important Buddhist tantra used in the Vajrayana schools of Buddhism, but can refer to a number of different works. In particular a cycle of 18 texts studied by Amoghavajra, which included both Sarvatathāgatatattvasaṃgraha Tantra and the Guhyasamaja Tantra, a Tibetan text which appears to be composed of two works grouped together and to further confuse matters in the Japanese Shingon school the Sarvatathāgatatattvasaṃgraha Tantra is known by this name. In Tibetan it is considered to be the main representative of the Yoga Tantra class of texts.
The sutra begins with Mahavairocana Buddha preaching the Dharma to a great host of Bodhisattvas, including Vajrasattva, in the Buddhist heaven of Akanishta. As he preaches the Dharma, Prince Sarvarthasiddhi, the esoteric name of the Buddha, Siddhartha Gautama, is meditating under the Bodhi Tree. Enlightenment is imminent, but the Prince has still not attained it because he is still attached in some...