Why do all the Buddhas in the entire universe throughout the past, present, and future protect especially the Lotus Sūtra? It is because the Lotus Sūtra is the parent, wet nurse, and master of Buddhas in the entire universe throughout the past, present, and future. They say that frogs feed, hearing the voice of their mothers; if they don’t hear the voice of their mothers, they will not feed and grow up. The Indian lizard called kṛkalāsa eats in the wind; it won’t grow if there is no wind. A fish lives in the water, and a bird makes a nest in the tree. Likewise, Buddhas live in the Lotus Sūtra. As the moon’s reflection resides in the water, Buddhas reside in the Lotus Sūtra. Therefore, you must remember that where there is no Lotus Sūtra, there are no Buddhas.

Ueno-dono Haha-ama Gozen Gohenji, A Response to My Lady the Nun, Mother of Lord Ueno, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 181