Yoshiro Tamura, "Introduction to the Lotus Sutra", p106-107[L]ooking at the Lotus Sutra from a point of view that combines the traditional perspective with that of its historical formation, we can conclude that the sutra is comprised of three factors: (1) the true (Dharma), (2) the personal (Buddha), and (3) the human (bodhisattva). That is, the unifying truth of the cosmos corresponds to the theme of the first division (the teaching of the historical Shakyamuni), the eternal personal life to that of the second division (the teaching of the Everlasting Original Shakyamuni), and human action in this world to the theme of the third division. These three factors succinctly express the title of the Lotus Sutra—Wonderful Dharma Flower Sutra (Saddharmapuṇḍarika Sutra). “Wonderful Dharma” (saddharma) means that which defines the truth. “Sutra” means the teaching of the Buddha, thus that which is related to the Buddha. And the middle term, “Flower” (puṇḍarika), signifies the bodhisattvas. The unifying truth of the cosmos is the eternally living truth of life and persons, and this is a practical truth that we ought to concretely embody in the world. This is concisely expressed in the phrase that makes up the title “Wonderful Dharma Flower Sutra,” the Lotus Sutra. Therefore, Nichiren emphasized embracing the title and reciting it.
Thus, the Lotus Sutra has three characteristic ideas. Lotus Sutra and Tiantai theory developed in distinct ways according to which of these characteristics they emphasized.