Kadag - Primordial Purity
The original purity of awareness, never contaminated by delusion.
Kadag in Dzogchen refers to the primordial purity of the nature of mind. From the very beginning, mind's nature has been pure - defilements are adventitious and never truly stain the basic nature.
From the very beginning, all beings are Buddha.
Kadag represents the emptiness aspect of the nature of mind.
Dzogchen Tantras