“The Furthest Everlasting Continuum” (“Uttaratantra”) deals with Buddha-nature, the root from which the stages of realization can arise. It is the source containing all the core factors for becoming a Buddha. On the basis of the everlasting mental continuum of a practitioner, good qualities can be developed and faults can be removed. His Holiness the Dalai Lama focuses here on an in-depth analysis of the various terms referring to Buddha-nature, based on an assortment of Tibetan commentaries.