The three main perspectives of buddha nature - exoteric, esoteric and mystical - may yield realisation in different ways, but it is the same state that is realised. Whether we call it buddha nature or the clear light of bliss, the nature of the mind, or the Ground Mahamudra, it is still the same spiritual state. The experiences accompanying each realisation may also be different, but in the end what is realised is the same enlightened state

-- Traleg Kyabgon Rinpoche