phyi nang sgrub gsang

ཕྱི་ནང་སྒྲུབ་གསང
outer, inner, sadhana, and the secret. The four empowerments of the outer, the inner, the sadhana, and the secret are included within the four rivers of empowerment: the outer empowerment river of the water of tantra, the inner empowerment river of mastery, the sadhana empowerment river of renown, and the secret empowerment river of perfection. The empowerment ritual for the Embodiment Scripture contains more extensive details of these. [RY]