Profound Inner Meaning
The Profound Inner Meaning, (Wyl. zab mo nang don) is a text in verse composed by the 3rd Karmapa Incarnation Line Rigpa'i Dorje, who also wrote a commentary (‘’rnam shes ye shes ‘byed pa’i Ti ka’’).
The text is overview of the principles of Highest Yoga Tantra, with a particular focus on the vajra body—the way the tantras understand the body and the way it functions—, which is the basis of kyerim and dzogrim practices.
Tibetan Text
http://tbrc.org/#library_work_ViewInWIndow-W679%7C1701%7C1%7C1%7C1%7C79
English Translation
‘’The Profound Inner Principles, with Jamgon Kongtrul Lodro Taye’s commentary Illuminating the “Profound Principles”, Transl. E. Calahan, Shambhala, 2013.