However, Saicho, who advocated hokke-ichijo (Hokke scripture-based philosophy) and Kukai, who advocated mitsugon-ichijo (Esoteric Buddhism-based philosophy), eventually confronted each other.
しかし、法華一乗を掲げる最澄と密厳一乗を標榜する空海とは徐々に対立するようになった。