-- Yongey Mingyur Rinpoche, "Turning Confusion into Clarity: A Guide to the
Foundation Practices of Tibetan Buddhism", published by Shambhala
Publications.
+~
+The key to understanding the Mahayana and Vajrayana views lies in
+Nagarjuna’s reasonings. This is because the reason the aggregates and
+suffering can be described as being pure by nature is that they are empty by
+nature—they are unborn. They never actually come into existence. Something
+that never really comes into existence cannot possibly be impure, for what is
+there to be impure in the first place? It is like getting covered with filth
+in a dream—no matter how dirty you might seem to be, since not a single
+particle of the filth is real, in fact there is no impurity at all. Since
+there is no impurity, there cannot actually be any purity either, just as when
+you take a bath in the dream after having gotten so filthy, your cleanliness
+after the bath is just as lacking in reality as the dirtiness that preceded
+it. Therefore, the true nature of the dream transcends both purity and
+impurity, and this is given the name “original purity.” We have to
+understand that what original purity refers to is the freedom from all
+fabrications, the emptiness in which we can gain certainty by using
+Nagarjuna’s reasonings.
+ -- Khenpo Tsultrim Gyamtso, from "The Sun of Wisdom: Teachings on the Noble
+ Nagarjuna’s Fundamental Wisdom of the Middle Way", published by Shambhala
+ Publications
+