Rigpa, Tib. རིག་པ་དོན་གྱི་བླ་མ་, rigpa dön gyi lama - the absolute teacher, which is the true nature of mind. 

 “Rigpa is a Tibetan word, which in general means ‘intelligence’ or ‘awareness’. In Dzogchen, however, the highest teachings in the Buddhist tradition of Tibet, rigpa has a deeper connotation, ‘the innermost nature of the mind’. The whole of the teaching of Buddha is directed towards realizing this, our ultimate nature, the state of omniscience or enlightenment – a truth so universal, so primordial that it goes beyond all limits, and beyond even religion itself.” Sogyal Rinpoche

 Guru Yoga (Skt. guruyoga; Tib. བླ་མའི་རྣལ་འབྱོར་, — the practice of merging one’s mind with the wisdom mind of the absolute teacher, requesting his blessings, receiving his blessings (the true meaning of blessing is defined here as a transformation in which your mind transcends into the state of the absolute!),  and merging one’s mind with the master’s wisdom mind: