Śākyamuni Buddha preaches in chapter 3 on “A Parable” of the Lotus Sūtra, “All living beings in this world are My children. There are many sufferings in this world, and only I can save all living beings.” This explains that only Śākyamuni Buddha possesses the three virtues of the master, the teacher and the parent, and other Buddhas such as the Buddha of Infinite Life are not equipped with them. I have already told this many times before. However, be sure that the words “only I can” are not found in Hinayāna sūtras nor in any of the pre-Lotus Mahāyāna sūtras, which resort to expedient means or do not reveal the truth to those whose capacities to understand are not sufficient. They are the golden words of Śākyamuni Buddha in the Lotus Sūtra, validated by the Buddha of Many Treasures and all other Buddhas from all the worlds throughout the universe.

Gochū Shujō Gosho, People in the World Letter, Writings of Nichiren Shōnin, Doctrine 2, Page 201