Lotus Sutra
Thus esoteric Buddhism became an important aspect of the Tendai school, which was primarily focused on the Lotus Sutra. However, unlike the Shingon school (which saw esoteric practice as superior to the Lotus Sutra), Saichō held to the "identity of the purport of Perfect and Esoteric teachings" ("enmitsu itchi" 円密一致) which means there is a unity and agreement among the teachings of the Lotus Sutra and Esoteric Buddhism."