Buddha-nature is the luminous, ceaseless, and primordial nature of mind. It has not been fabricated or created by various causes and conditions. It does not dwell as a separate entity that truly exists. It did not begin and therefore it cannot cease. It is simply the ultimate nature of phenomena.
Shechen Rabjam Rinpoche
from the book The Great Medicine That Conquers Clinging to the Notion of Reality: Steps in Meditation on the Enlightened Mind
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