Day 17 covers all of Chapter 12, Devadatta, and opens Chapter 13, Encouragement for Keeping this Sutra.
Having last month heard Medicine-King Bodhisattva-mahāsattva and Great-Eloquence Bodhisattva-mahāsattva’s vow to uphold the Lotus Sūtra, we hear from Arhats and Śrāvakas who vow to preach the Lotus Sūtra in some other world.
At that time there were five hundred Arhats in this congregation. They had already been assured of their future attainment [of Anuttara-samyak-saṃbodhi]. They said to the Buddha, “World-Honored One! We also vow to expound this sūtra [but we will expound it] in some other worlds [rather than in this Sahā-World].”
There were also eight thousand Śrāvakas some of whom had something more to learn while others had nothing more to learn. They had already been assured of their future attainment [of Anuttara-samyak-saṃbodhi]. They rose from their seats, joined their hands together towards the Buddha and vowed:
“World-Honored One! We also will expound this sūtra in some other worlds because the people of this Sahā-World have many evils. They are arrogant. They have few merits. They are angry, defiled, ready to flatter others, and insincere.”
In his letter Treatise on the Teaching, Nichiren used the hesitance of the Arhats and Śrāvakas to preach in the Sahā world to show what he was up against:
It is predicted in the Lotus Sūtra, in the 13th chapter “Encouragement for Upholding This Sūtra,” that 2000 years after the Buddha’s extinction, in the Latter Age of Degeneration, three kinds of enemies will appear against those who spread the Lotus Sūtra. The time at hand matches exactly the Latter Age of Degeneration preached in the Lotus Sūtra as the “fifth 500-year period” after the death of the Buddha. As I, Nichiren, contemplate whether or not the Buddha’s words have proved to be true, three kinds of enemies surely exist today. If I deny the existence of the three enemies and spread the Lotus Sūtra in a manner so as to avoid persecution, I cannot claim to be a practicer of the Lotus Sūtra. On the other hand, if I spread the sūtra in such a way that I am persecuted by enemies, I certainly will lose my life.