Day 22 covers all of Chapter 17, The Variety of Merits.
Having last month considered what those who believe will see, we consider who those rejoice at hearing the longevity of the Buddha after his extinction.
“Furthermore, the good men or women who do not speak ill of this sūtra but rejoice at hearing it after my extinction, should be considered, know this, to have already understood my longevity by firm faith. It is needless to say this of those who [not only rejoice at hearing this sūtra but also] read, recite and keep it. They also should be considered to be carrying me on their heads. Ajita! They need not build a stupa or a monastery in my honor, or make the four kinds of offerings’ to the Saṃgha because those who keep, read and recite this sūtra should be considered to have already built a stupa or a monastery or made offerings to the Saṃgha. They should be considered to have already erected a stupa of the seven treasures tall enough to reach the Heaven of Brahman, the upper part of the stupa being the smaller. They should be considered to have already equipped the stupa with streamers, canopies and jeweled bells, and enshrined my śarīras therein. They also should be considered to have already offered flowers, incense, necklaces, incense powder, incense applicable to the skin, incense to burn, drums, music, reed pipes, flutes, harps, various kinds of dances, and songs of praise sung with wonderful voices [to the stupa ] continuously for many thousands of billions of kalpas.
“Ajita! Anyone who, after hearing this sūtra, keeps or copies it or causes others to copy it after my extinction, should be considered to have already built many hundreds of thousands of billions of monasteries, that is to say, innumerable monasteries, each of which was installed with thirty-two beautiful halls made of red candana, eight times as tall as the tala-tree, and spacious enough to accommodate one hundred thousand bhikṣus. He also should be considered to have already furnished [those monasteries] with gardens, forests, pools for bathing, promenades, and caves for the practice of dhyāna, and filled [those monasteries] with clothing, food, drink, bedding, medicine, and things for amusements, and offered [those monasteries] to me and to the Saṃgha of bhikṣus in my presence. Therefore, I say, ‘Anyone who keeps, reads or recites this sūtra, expounds it to others, copies it, causes others to copy it, or makes offerings to a copy of it after my extinction, need not build a stupa or a monastery, or make offering to the Saṃgha.’ Needless to say, anyone who not only keeps this sūtra but also gives alms, observe the precepts, practices patience, makes endeavors, concentrates his mind, and seeks wisdom, will be able to obtain the most excellent and innumerable merits. His merits will be as limitless as the sky is in the east, west, south, north, the four intermediate quarters, the zenith, and the nadir. These innumerable merits of his will help him obtain the knowledge of the equality and differences of all things.
Nichiren uses this section of this chapter to underscore the various levels of practice.
Because in a later section, when speaking of the fourth stage of practice the sūtra says, “Needless to say, anyone who not only keeps this sūtra but also gives alms, observes the precepts, practices patience, makes endeavors, concentrates his mind, and seeks wisdom, will be able to obtain the most excellent and innumerable merits.” This passage from the sūtra makes it clear that people in the first, second, and third stages of practice should refrain giving alms, observing the precepts, and the rest of the first five bodhisattva practices until they arrive at the fourth stage of practice and then they are allowed to begin practicing them. Therefore, if they are only allowed to practice them at this stage, we know that they should refrain from practicing them in the first stage.
Shishin Gohon-shō, The Four Depths of Faith and Five Stages of Practice, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 104
See also this portion of the same letter.