Unravelling Mantra’s Meaning in The Heart of Wisdom Sutra

This short commentary (Toh. 4353) on the secret mantra or tantric meaning of the famous Heart Sutra is attributed to the Atiyoga teacher Arya Shri Simha. According to the colophon, he gave this explanation to his disciple Lotsawa Vairotsana, who put it into writing and taught it to Dharma King Trisong Detsen.