Let me next use a metaphor of a mountain to help explain the Lotus Sūtra. There are ten mountains of treasures, of which Mt. Sumeru is supreme. The ten mountains of treasures consist of 1. Sessen (Snowy Mt.), 2. Kōsen (Fragrant Mt.), 3. Karira-sen (Mt. Kharādiya), 4. Senshō-sen (Hermit Sage Mt.), 5. Yugenta-sen, 6. Meni-sen, 7. Nimindara-sen, 8. Shakara-sen, 9. Shukue-sen, and 10. Mt. Sumeru. The first nine of these ten mountains are like sūtras other than the Lotus Sūtra, though each of them is equipped with a treasure. Mt. Sumeru is equipped with all the nine treasures, each of which is superior in quality to the one in the corresponding mountain. It is like how gold in the mundane world is valuable but not comparable to the purplish gold said to be from the river running through the mango forest in the Jambudvīpa continent.

Yakuō-bon Tokui-shō, The Essence of the “Medicine King Bodhisattva” Chapter, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 30