“The Teacher of the Dharma” chapter of the Lotus Sūtra preaches, “The highest and most perfect enlightenment that all bodhisattvas should attain is expounded only in this sūtra.” The bodhisattvas in this passage refer to living beings in the nine realms. It means that all the people, virtuous or wicked or female or male, the śrāvaka, pratyekabuddha, and bodhisattvas in the Tripiṭaka teaching, the Three Vehicles (śrāvaka, pratyekabuddha, and bodhisattvas) in the Common teaching, the bodhisattvas in the Distinct teaching, and the bodhisattvas in the Perfect teaching of the pre-Lotus sūtras must depend on the power of the Lotus Sūtra for becoming Buddhas.

The same chapter also preaches, “Medicine King! Know this that although many laymen or monks will practice the way of bodhisattvas, they will not be able to practice it satisfactorily unless they see, hear, read, recite, copy or keep this Sūtra of the Lotus Flower of the Wonderful Dharma or make offerings to it.” This obviously means that though the bodhisattvas practice the Six Bodhisattva Practices and the Four Great Vows through the expedient practices of the Tripiṭaka teaching taking three hundred asaṃkhya kalpa, the Common teaching taking numerous dust-particle kalpa, and the Distinct teaching taking numerous asaṃkhya kalpa, they practice neither the right practices of bodhisattvas nor meritorious good acts until they reach the Lotus Sūtra. It is obvious that they cannot become Buddhas because they do not practice the right way of bodhisattvas.

Ichidai Shōgyō Tai-I, Outline of All the Holy Teachings of the Buddha, Writings of Nichiren Shōnin, Doctrine 3, Page 82