This volume includes five texts by Kukai (""On the Differences between the Exoteric and Esoteric Teachings""; ""The Meaning of Becoming a Buddha in This Very Body""; ""The Meanings of Sound, Sign, and Reality""; ""The Meanings of the Word Hum""; and, ""The Precious Key to the Secret Treasury""), and two by Kakuban (""The Illuminating Secret Commentary on the Five Cakras and the Nine Syllables""; and ""The Mitsugonin Confession"").

Translated by: Rolf W Giebel, Dale A Todaro