The Nirvana Sūtra also states:

“Śākyamuni Buddha then took a bit of soil, put it on a fingernail, and asked Bodhisattva Kāśyapa which had more soil: the fingernail or the entire worlds throughout the universe? Bodhisattva Kāśyapa answered that it was clear that the soil on a fingernail could not compare in amount with that in all the worlds all over the universe. The Buddha then preached: “People who commit the four major sins or the five rebellious sins, and those who cut off the root of merit to become an icchantika, and who do not believe in this sūtra are as vast in amount as the soil in the entire worlds in the whole universe. On the contrary, those who do not commit the five rebellious sins, do not become an icchantika, do not cut off the root of merit, and uphold this Nirvana Sūtra are as scarce as the amount of soil on a fingernail.”

According to this passage in the Nirvana Sūtra, which is supplementary to the Lotus Sūtra, those who do not believe in the Lotus Sūtra are as numerous as the amount of soil in all the worlds throughout the universe while those who believe in it, like Nichiren, are as rare as the amount of soil on a fingernail in Japan today.

Shingon Shoshū Imoku, Differences between the Lotus Sect and Other Sects Such as the True Word Sect, Writings of Nichiren Shōnin, Doctrine 2, Page 122-123