Within the Tiantai tradition, the Lotus Sutra is revered as the supreme and final expression of the Buddha’s teaching, the “perfect” revelation that both encompasses and surpasses all other scriptures. Earlier doctrines and sutras are read as provisional, as skillful means tailored to the capacities of particular audiences, while the Lotus is taken to disclose the complete and integrated truth. On this basis, Tiantai constructs a doctrinal classification in which the Lotus Sutra stands as the “Perfect Teaching,” harmonizing and reinterpreting the partial truths of other texts rather than rejecting them. What might appear as contradictions among different Buddhist teachings are thus seen as different layers of guidance, all ultimately oriented toward the vision articulated in the Lotus.

A central feature of this vision is the teaching of the One Vehicle (ekayāna): the claim that the various paths—śrāvaka, pratyekabuddha, and bodhisattva—are not ultimately separate, but converge in a single Buddha Vehicle. Tiantai interprets this as a strong affirmation that all beings possess the capacity for Buddhahood and that no spiritual destiny is fixed or inferior by nature. This universal potential is closely tied to the Lotus Sutra’s revelation of the Buddha as eternal: the historical Śākyamuni is understood as a manifestation of an enlightenment that is beginningless and ongoing. The Buddha is not merely a figure of the past, but an ever-present principle whose compassionate activity underlies all provisional teachings.

Tiantai also reads the Lotus Sutra through its philosophical lens of the Threefold Truth: emptiness, conventional existence, and the middle that holds these two without contradiction. The sutra is taken to exemplify this non-dual vision, in which all phenomena are empty of fixed essence yet function provisionally and meaningfully. From this standpoint, the interpenetration of all phenomena becomes a hallmark of Tiantai interpretation: every moment of thought is said to contain the full range of realms and conditions, so that ordinary mind and Buddha-mind are not ultimately separate. The Lotus Sutra’s portrayal of universal Buddhahood and the Buddha’s eternal presence thus serves as the scriptural ground for a worldview in which all paths, all beings, and all moments are enfolded within a single, perfect teaching.