Nāgārjuna’s Fundamental Treatise on the Middle Called “Wisdom” says:

Doctrines taught by the Buddha
Rely wholly on the two truths.

In this book on the two truths all of Jam-yang-zhay-pa’s Great Exposition of Tenets and almost all of Ngag-wang-pal-dan’s Annotations are provided for the first time.
Greatly expanding this exposition of Buddha’s fundamental teaching, the combined presentation of these two authors, Jam-yang-zhay-pa and Ngag-wang-pal-dan, offers an intriguing anthology of Indian sources and a provocative display of Tibetan and Mongolian ingenuity, carving consistent meaning from, and perhaps beyond, these sources.
At the heart of this program of study is the uncovering of the veil of false appearance preventing perception of the true nature of phenomena, undermining the ignorance assuming that phenomena exist the way they appear and thus assuming that these things around us are suitable objects of lust, hatred,
and all the other afflictive emotions. It calls for using our intelligence to unmask the deceptive appearance of phenomena in order to cease belief in the way things so concretely
appear, drawing us into the mess of a cycle of pain.