Revealing the single path to Buddhahood in the Āgama sūtras, the Lotus Sūtra preaches in chapter two, “Expedients,” “I expounded various Hinayāna sūtras according to the capacities of all living beings. They are the entrance to the Mahāyāna teaching.” Revealing the single path to Buddhahood in the Flower Garland Sūtra, the Lotus Sūtra states in chapter 16, “The Life Span of the Buddha,” “The gods, men and asura in the world think that I, Śākyamuni Buddha, left the palace of the Śākyas, sat at the place of enlightenment not far from the City of Gayā, and attained Buddhahood. To tell the truth, however, it has been innumerable kalpa (aeons) since I attained Buddhahood.” In the case of the Wisdom Sūtra, the Lotus Sūtra states 18 types of voidness in chapter 14, “Peaceful Practices”—the voidness which is expounded in the Wisdom Sūtra is included in the Lotus Sūtra. In the case of the Sūtra of Meditation on the Buddha of Infinite Life, the Lotus Sūtra preaches the doctrine of reaching the Pure Land of Peace in chapter 23, “Anyone who hears this sūtra and acts according to its teaching will be reborn in this Pure Land upon death.” As for practicing virtuous deeds with distracted minds, the Lotus Sūtra reveals the single path by saying in chapter 2, “Expedients,” “Those who chanted just once ‘Namu Buddha’ without concentration in mind, have already attained the enlightenment of the Buddha.” For all living beings, the Lotus Sūtra says in chapter 3, “A Parable,” “This triple world is My property. All living beings therein are My children.” For the non-Buddhist teachings and writings, the Lotus Sūtra says in chapter 19, “The Merits of the Teacher of the Dharma,” “When they expound the scriptures of non-Buddhist schools, or give advice to the government, or teach the way to earn a livelihood, they will be able to be in accord with the right teachings of the Buddha.” Passages that describe the revelation of the single path to Buddhahood in the Tuṣita Heaven or of gods and men are too numerous to write them all down here.
Ichidai Shōgyō Tai-I, Outline of All the Holy Teachings of the Buddha, Writings of Nichiren Shōnin, Doctrine 3, Page 93