After many years Shri Singha met Manjushrimitra in the charnel ground of Sosaling, and remained with him for twenty-five years. Having transmitted all the oral instructions, the great master Manjushrimitra dissolved his bodily form into a mass of light. When Shri Singha cried out in despair and uttered songs of deep yearning, Manjushrimitra appeared again and bestowed him with a tiny casket of precious substance.
The casket contained his master's final words, a vital instruction named Gomnyam Drugpa, “the Six Experiences of Meditation”. Having received this transmission, Shri Singha reached ultimate confidence. In Bodhgaya he found the manuscripts of the tantras previously hidden by Manjushrimitra which he took to China where he classified the Instruction Section into four parts: the outer, inner, secret, and the innermost unexcelled sections.