ultimate truth

(rdzogs pa chen po snga 'gyur phyi 'gyur). This phrase refers to the Eighteen Major Scriptures of the Mind Section, a set of Dzogchen tantras taught by Shri Singha to Vairochana and Lekdrub of Tsang, as listed in chapter Fourteen of The Lotus-Born (Shambhala Pub.), or, what's more commonly known as Sanglingma. Five of them were translated by Vairochana before his exile to Tsawarong while the remaining thirteen were later translated by Vimalamitra and Yudra Nyingpo, hence the name. [ZL] [RY]