法華義疏 5.129

5.129

From “Padmaprabha Tathāgata also uses the triyāna to teach and transform” onwards is third: explaining the fruit of the doctrinal gate. “Because of his original vows he expounds the triyāna” is said to resolve doubts. The Expedient Means Chapter states that the Buddhas appear in evil worlds of the five corruptions and therefore expound the triyāna; since Śāriputra now appears in a pure land, why does he also expound the triyāna? Therefore it explains: although the time of that Buddha's appearance is not an evil world, because of his original vows he expounds the teaching of the triyāna. Thus, Śākyamuni appeared in a defiled land and therefore expounded the triyāna, while Śāriputra expounds the triyāna because of his original vows—each having their respective reason.