With video BA6Q3 Ringu Tulku kindly answers some more questions submitted concerning the first few verses of the Sixth Chapter of the Bodhicharyavatara and some earlier stanzas as well.
Regarding the question in this video concerning The Sutra of the Essence of the Sky, we found the following information which might offer some help. In Sanskrit it is called Akashagarbha Sutra and in Tibetan nam mkha’i snyingpo’i mdo. The Tibetan text can be seen here in this link. We could not find an English translation, but there seems to be a book in German. The two texts written both by Shantideva and by Nagarjuna are Digest of All Disciplines (Sanskrit: Shiksasamuccaya), and Digest of All Sutras (Sanskrit: Sutrasamuccaya). The first one has been translated to English in 1922 by Cecil Bendall and W.H.D. Rouse and can be read online through this link.
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