It is said in the Lotus Sūtra, fascicle 7 (chapter 23), “Mt. Sumeru is the greatest of mountains. Likewise, this Lotus Sūtra is supreme of all sūtras.” This means that the Lotus Sūtra transmitted to Japan is like Mt. Sumeru while all other sutras, that is 5,000 or 7,000 fascicles of pre-Lotus Sūtras such as the Flower Garland, Great Wisdom, and Great Sun Buddha Sūtras; the Sūtra of Infinite Meaning, which was preached at the same time as the Lotus Sūtra; and post-Lotus Sūtras such as the Nirvana Sūtra, as well as all the Buddhist sutras in India, the dragon’s palace, the heavens of the Four Heavenly Kings, Trāyastriṃsá Heaven, the sun and moon, and all the worlds in the universe are like earth mountains, black mountains, Small Surround ing Iron Mountains and Great Surrounding Iron Mountains, which encircle Mt. Sumeru.

Senji-shō, Selecting the Right time: A Tract by Nichiren, the Buddha’s Disciple, Writings of Nichiren Shōnin, Doctrine 1, Page 246-247