Je Tsongkapa’s Illumination of the True Thought is one of the greatest presentations of emptiness in history. This work in turn is an explanation of Entering the Middle Way, by Master Chandrakirti, who lived during the seventh century and was commenting himself upon the 3rd‐century author Arya Nagarjuna, whose Root Text on the Wisdom of the Middle Way is considered the greatest commentary of all time upon the emptiness teachings of the Buddha himself.
Geshe Michael has said that in his opinion these are the greatest books about emptiness that have ever been written, and to have an opportunity to go through these books in an authentic way is extremely rare. Just to be able to hear them is unbelievably rare. It took him eight years in the monastery to learn these texts, after 2 years everyone else in the class dropped out and Geshe Michael was the only student left.
If they were to view
Following an ethical way of life purely
As something that existed by nature,
Then their ethics would no longer be pure.
Thus it is that they are always free
Of their mind running in duality
Towards any of the three.