The four broad categories of transmission … may be said to encapsulate the entire T’ien-t’ai/Tendai system of doctrine and meditation, reinterpreted from a hongaku perspective. They deal, from four different perspectives, with the same concept: the total and perfect identity of the single thought-moment with the cosmos or dharma realm, a reality cognized as empty, conventionally existing, and both simultaneously. This reality is held to be the essence of Chih-i’s inner enlightenment, the deepest meaning of the Lotus Sūtra, and the truth to be accessed by the practitioner. (Page 184)