 So, the perfect nature—nondual mind, i.e., emptiness (śūnyatā) of the subject-object duality—is the ultimate reality of the Yogācāra conception. Ultimate truth takes various forms as it is understood within the Yogācārin tradition. As Maitreyanātha states, ultimate truth takes three primary forms—as emptiness it is the ultimate object, as nirvāṇa it is the ultimate attainment, and as nonconceptual knowledge it is the ultimate realization ([MVK], Sems tsam phi 42B).