During the latter part of the Eighth Century of our era, the Tibetan translator Vairochana went to India in search of the teachings on instantaneous enlightenment that are known as the Great Perfection. In India, Vairochana met his teacher, Sri Singha, and lived there in Dhahena, studying with him for many years. During this time they published translations into Tibetan of numerous important works, and these early translations became exemplars for the work that came later. It is clear that Vairochana’s translations were being read by members of the ex-patriot Tibetan community even before he returned to Tibet, and that copies of his translations were probably being read in Tibet even while he was still in India. The four Tantras translated in the present volume belong to this early period. We have The Tantra on Secret Wisdom, the Tantra on the Perfect Wisdom of the Bodhicitta, the Tantra on the Lamp for Secret Wisdom, and the Tantra that Displays the Precious Noble Path. According to the system that divides the Great Perfection scriptures into three classes: The Mind Section, the Space Section, and the Upadeśa Instruction Section, these Tantras belong in the Space Section.