Most theories of buddha-nature circulating in medieval Japan entailed the proposition that all phenomena, being empty, are nondual and mutually inclusive, each encompassing and pervading all others without losing its individual character; thus the “buddha” is somehow present in ordinary beings. To many Buddhist thinkers, this suggested the possibility that buddhahood could be attained quickly. “Realizing buddhahood with this very body” (sokushin jōbutsu)—what it might mean, its preconditions, and the practices for achieving it—was vociferously debated. Concern for rapid attainment culminated in the Tendai Buddhist doctrine of original enlightenment (hongaku hōmon), which asserts that buddhahood is not a goal at […]