Day 22 covers all of Chapter 17, The Variety of Merits.

Day 22 Text with annotations

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.

Day 21 covers all of Chapter 16, The Duration of the Life of the Tathāgata.

Day 21 Text with annotations

Having last month learned why Śākyamuni says ‘I shall pass away,’ we begin the Parable of the Skillful Physician and His Sick Children.

“Good men! All the Buddhas, all the Tathāgatas, do the same as I do. [They expound their teachings] for the purpose of saving all living beings. Therefore, [their teachings] are true, not false.

“I will tell you a parable. There was once an excellent and wise physician. He was good at dispensing medicines and curing diseases. He had many sons, numbering ten, twenty, or a hundred. [One day] he went to a remote country on business. After he left home, the sons took poison. The poison passed into their bodies, and the sons writhed in agony, rolling on the ground. At that time the father returned home. Some sons had already lost their right minds while the others still had not. All the sons saw their father in the distance and had great joy. They begged him on their knees, saying, ‘You came back safely. We were ignorant. We took poison by mistake. Cure us, and give us back our lives!’

“Seeing his sons suffering so much, the father consulted books of prescriptions, and collected good herbs. having a good color, smell and taste. He compounded a medicine by pounding and sieving the herbs, and gave it to them, saying, ‘This is a very good medicine. It has good color, smell and taste. Take it! It will remove the pain at once and you will not suffer any more.’

“The sons who had not lost their right minds saw that this good medicine had a good color and smell, took it at once, and were cured completely. But the sons who had already lost their right minds did not consent to take the medicine given to them, although they rejoiced at seeing their father come home and asked him to cure them, because they were so perverted that they did not believe that this medicine having a good color and smell had a good taste.

Nichiren discusses the sick children in his letter A Treatise Revealing the Spiritual Contemplation and the Most Verable One:

When we think of the Buddha’s intent reflected upon the clear mirror of these scriptures, we see that His appearance in this world was not for the sake of those who heard Him preach the Lotus Sūtra for eight years on Mt. Sacred Eagle. It was for those in the Ages of the True Dharma and the Semblance Dharma, and in the Latter Age of Degeneration. More precisely, it was not for the sake of those in the 2,000 years of the True Dharma and the Semblance Dharma, but for those like myself in the beginning of the Latter Age. The “sick ones” refer to the slanderers of the Lotus Sūtra after the death of Śākyamuni Buddha. It was “for those who did not perceive and accept this medicine excellent both in color and flavor” that the Buddha said he would “leave this excellent medicine.”

If we think of it this way, we can see why the bodhisattvas from underground did not appear during the Ages of the True Dharma and the Semblance Dharma. The 1,000-year Age of the True Dharma was appropriate for Hinayāna and provisional Mahāyāna Buddhism, but not fit for the preaching of the Lotus Sūtra in terms of both the “capacity” of those to be taught and the “time” for it to be preached. Therefore, four ranks of Bodhisattva-teachers (Four Reliances) preached the Hinayāna and provisional Mahāyāna teachings in order for the people to attain Buddhahood by nurturing the seed of Buddhahood that they had received during the lifetime of Śākyamuni Buddha. They did not preach the Lotus Sūtra then because they knew that if they had preached it, many people would have slandered it rendering it impossible to nurture the seed of Buddhahood. The capacity of the people for comprehension then was like that of those who listened to the Buddha preach in the first four of the five periods during His lifetime.

Kanjin Honzon-shō, A Treatise Revealing the Spiritual Contemplation and the Most Verable One, Writings of Nichiren Shōnin, Doctrine 2, Page 161