[B]eginning with Śākyamuni Buddha, such Buddhas as the Buddha of Infinite Life, Medicine Master Buddha, and the Buddha of Many Treasures as well as such bodhisattvas as Avalokiteśvara, Mahāsthāmaprāpta, Samantabhadra, and Mañjuśrī are compassionate parents to us. You should not forget that the ultimate doctrine of compassion with which these Buddhas and bodhisattvas guide the people is solely in the Lotus Sūtra. You should remember that the secret doctrine to save the evil, the stupid, women, and those without Buddha-nature is not revealed in sūtras other than the Lotus Sūtra. This is the very reason why the Lotus Sūtra is superior to all other Buddhist scriptures.

Shō Hokke Daimoku-shō, Treastise on Chanting the Daimoku of the Lotus Sūtra, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 14