On a related note, Saicho taught Enmitsu icchi (Agreement of Tendai Integrate Teachings and Esoteric Teachings) from the standpoint of Shishu (also pronounced Yonshu) kengaku (learning the four sects) in an attempt to subsume Buddhist scriptures centering on the Lotus Sutra, and with the aim of establishing a Tendai doctrine unique to Japan and different from the Chinese Tendai sect.
なお、最澄は中国の天台宗とは趣を異にした日本独自の天台教学の確立を目標に、法華経を中心としつつ他の仏教の経典を包摂しようと試みた四宗兼学という立場から、円密一致を説いている。