Kensho, literally seeing nature, names the moment Rinzai teaching holds a practitioner directly perceives their own fundamental nature, understood in Zen doctrine as identical with buddha-nature rather than as a private psychological insight about the self. The term is often used alongside satori, and while the two are sometimes treated as synonyms in casual use, Rinzai teachers commonly distinguish them by depth and consequence: kensho names an initial breakthrough, frequently associated with completing an early koan in Hakuin's curriculum, while satori can refer to a more thoroughgoing realization that later, harder cases are meant to deepen and confirm. Zen literature is emphatic that kensho is not a state to be described in advance or aimed at directly, since making it an object of grasping is held to be exactly the discriminating activity koan work is meant to exhaust; teachers instead describe it as an event a student typically cannot anticipate or produce by will, arriving at the point where sustained effort against an insoluble question collapses. The Princeton Dictionary of Buddhism's entry on the term situates kensho within the wider East Asian Buddhist vocabulary of sudden awakening, tracing the concept's roots to Chan debates over sudden versus gradual enlightenment that predate the word's specifically Japanese Rinzai usage by centuries.