Maybe he dreamt it an forgot to write the text down
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I haven’t, but would be fascinated to hear about it! I only know of the later and more famous Karma Chagme text abt the “Union of Dzogchen and Mahamudra,” but not a “Nyingma Mahamudra,” which sounds more unexpected
Yeah I’ve seen things here and there and it’s common enough for some Kagyu-Nyingma teachers. TNR was quite influential on Jigme Lingpa in this area also, applying the four yogas of mahamudra to dzogchen instruction, but never could find that text he cited. Mostly just curious.
I just love that you are reading Tsele Natsok Rangdrol
Bestill my heart.
I love his work, have found it inspiring. I’d like to learn more about his life story some time, also.
Check Mipham Rinpoche on https://www.lotsawahouse.org/tibetan-masters/mipham/ … and I think you’ll find interesting info. 
Thanks Peter, did you have a particular text in mind? Mipham left some amazing material eh.
"All the innumerable and profound teachings, such as Mahamudra & Dzogchen, which are decisive & unmistaken in each root text, are indispensable when teaching disciples who will hold the Dharma-lineages. But for personal practice, for the sake of the future, it is more profound to
Karma Chagmé too.
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