Reddit mentions of Mountain Doctrine: Tibet's Fundamental Treatise on Other-Emptiness and the Buddha Matrix

Yours on Amazon for only 115.89$! (kindle is cheaper, though)

https://www.amazon.com/Mountain-Doctrine-Fundamental-Treatise-Other-Emptiness/dp/155939238X/ref=sr_1_1?keywords=the+mountain+doctrine&qid=1572009076&sr=8-1

I'd be really interested to hear more about their philosophy and why they were considered "heretical".

Buddhists and others have argued intensely about this very thing for thousands of years, and that's just here on this planet. The argument has been going on for endless aeons if you want to look at it that way.

(People really really want to know if ultimately anything Exists or not -- despite all the precautions against using the illusory organ of the conceptual mind to assert a relative idea. Who can blame us, though.)

I recommend buying this book,

Mountain Doctrine: Tibet's Fundamental Treatise On Other-Emptiness And The Buddha Matrix

if you want to get your feet muddy. Dolpopa's opponents will claim he's clearly "taking sides", but there exists no singular better exploration of the issue in words, if you ask me.

I have to agree with Growupandleave and suggest The Essence of Other-Emptiness by Jetsun Taranatha. This book presents Shentong in the context of a tenets book on the various tenet systems and is a very readable book on the subject.

Just as an aside, Taranatha was an important systamatizer of Shentong, but wasn't the progenitor of it. It was brought to Tibet by the early founders of the Jonang school and popularized by Dolpopa Sherab Gyaltsen. Dolpopa's magnum opus Mountain Doctrine has been translated, and lays out in detail how Dolpopa interprets all the Indian treatises, sutras, and tantras to fit his view.

Besides these Jonang sources there is a strong tradition within the Kagyu school of Shentong although it is not quite the same as Jonang Shentong. Karmazopa already mentioned Jamgong Kongtrul's Commentary on the Uttaratantra which is the standard commentary on that text in the Karma Kagyu school.

Karmazopa also mentioned Book 6 Part 3 of Kongtrul's [Treasury of Knowledge] lays out the Tenet systems, and includes a section on Shentong.

Earlier in the Kagyu school there was the Third Karmapa's Commentary on In Praise of Dharmadhatu translated by Brunnholzl.

In terms of modern books, Thrangu Rinpoche has a book that is a Commentary on the Uttaratantra that is quite readable.

You and I both know that the three turnings doctrines didn't originate from a Korean monk, but from sūtras such as the Saṃdhinirmocana Sūtra and the Śrīmālādevī Siṃhanāda Sūtra. You try so hard to discredit the doctrine, to the point where you're pretty much lying.

/u/thecowisflying Dölpopa's Mountain Doctrine is actually a pretty great read. Dölpopa, in the text, makes sure to use evidence from sūtras and tantras. He even cites from people like Candrakīrti and Nāgārjuna, whom are often thought to be in direct opposition to Tathāgatagarbha thought.