Chigi's Hokke gengi (Essentials of the Lotus Sutra), Hokke mongu (Commentary on the Lotus Sutra) and Makashikan (Mahayana Practice of Cessation and Contemplation) are collectively called Sandaibu (the three important scriptures) and are deemed as the essence of Tendai Sect Buddhism.
主に智顗の法華玄義、法華文句、摩訶止観の三大部を天台宗の要諦としている。