Ocean of Definitive Meaning: A Teaching for the Mountain Hermit (Wylie: ri chos nges don rgya mtsho), written in the first half of the 14th century, is considered the magnum opus of Dolpopa Sherab Gyaltsen (1292–1361).
[1] The Ocean of Definitive Meaning is a hermeneutical text on the issue of the doctrine of the Three Turnings of the Wheel of Dharma that was first codified in the Sandhinirmocana Sutra.
The Ocean of Definitive Meaning conveys a specific reading, understanding and interpretation of śūnyatā and Buddha-nature, of the second and third turnings of the wheel respectively.
[2][3] Jeffrey Hopkins (translator) and Kevin Vose (editor) rendered the Ocean of Definitive Meaning into English as Mountain Doctrine, published by Snow Lion, Ithaca in 2006 .
A third English rendering of The Ocean of Definitive Meaning entitled Ocean of Definitive Meaning: A Teaching for the Mountain Hermit is numbered volume seven of The Library of Tibetan Classics, a thirty-two volume series covering Tibet's classical literary heritage, published by Wisdom Publications.