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

Having last month considered how old is really, really old, we come to the expedients of the Eternal Buddha.

Good men! During this time I gave various names to myself, for instance, the Burning-Light Buddha. I also said, ‘That Buddha entered into Nirvana.’ I did all these things only as expedients.

Good men! When some people came to me, I saw the strength of the power of their faith and of the other faculties of theirs with the eyes of the Buddha. Then I named myself differently, and told them of the duration of my life differently, according to their capacities. I also said to them, ‘I shall enter into Nirvana.’ I expounded the Wonderful Dharma with these various expedients, and caused the living beings to rejoice.

Good men! When I saw that some people of little virtue and of much defilement were seeking the teachings of the Lesser Vehicle, I told them, ‘I renounced my family when I was young, and attained Anuttara-samyak-sambodhi [forty and odd years ago].’ In reality I became the Buddha in the remotest past as I previously stated. I told them this as an expedient to teach them, to lead them into the Way to Buddhahood.

Lotus World: An Illustrated Guide to the Gohonzon offers a view on this:

This view of Shakyamuni Buddha, specifically in the sixteenth chapter of the Lotus Sutra [as the original and eternal Buddha], is the key to the true nature of enlightenment according to Nichiren Buddhism.

“In Buddhism, various Buddhas have been established as objects of devotion for different pious believers. Since each Buddha has a good reason for being venerated, Buddhism permits us to worship any or all of them. Nevertheless, the Most-Venerable-One should be One, just as the Truth is One. The second half of the Lotus Sutra (Hammon) emphasizes such a Buddhist position regarding the unity of faith. As the object of faith is absolute, it must relate to the realm of eternity. Generally we think of Shakyamuni as a historical figure, bound by the limitations of time and space, and only a provisional manifestation of the infinite, eternal Buddha. According to the Lotus Sutra, however, every Buddha, including the historical Shakyamuni Buddha, is a representation of the eternal original being of Shakyamuni.”
Lotus World: An Illustrated Guide to the Gohonzon

Day 20 completes Chapter 15, The Appearance of Bodhisattvas from Underground, and concludes the Fifth Volume of the Sutra of the Lotus Flower of the Wonderful Dharma.

Having last month begun to review Maitreya Bodhisattva’s doubts in gathas, we come to the confusion of grey-haired sons and young fathers.

Suppose a man twenty-five years old
Points to grey-haired and wrinkle-faced men
A hundred years old,
And says, ‘They are my sons.’
Suppose old men point to a young man
And say, ‘He is our father.’
No one in tbe world will believe
That a father is younger than his sons.

You are like the father.
You attained enlightenment quite recently.
These Bodhisattvas are resolute in mind.
They are not timid.
They have practiced the Way of Bodhisattvas
For the past innumerable kalpas.

They are good at answering difficult questions.
They are fearless and patient.
They are handsome, powerful and virtuous.
They are praised by the Buddhas
Of the worlds of the ten quarters.
They expound [the Dharma] clearly.

They did not wish to live among men.
They preferred dwelling in dhyana-concentration.
They lived in the sky below
In order to attain the enlightenment of the Buddha.

The Daily Dharma from Sept. 24, 2016, offers this:

World-Honored One! It is difficult for anyone in the world to believe this. It is as difficult as to believe a handsome, black-haired man twenty-five years old who points to men a hundred years old and says, ‘They are my sons,’ or as to believe men a hundred years old who point to a young man and say, ‘This is our father. He brought us up.’

Day 19 concludes Chapter 14, Peaceful Practices, and begins Chapter 15, The Appearance of Bodhisattvas from Underground.

Having last month wonderful things in a dream, it’s time to resolve who will be responsible for protecting, keeping, reading, reciting and copying this sutra

Thereupon the Bodhisattva-mahasattvas, more than eight times the number of the sands of the River Ganges, who had come from the other worlds, rose from among the great multitude, joined their hands together towards the Buddha, bowed to him, and said:

World-Honored One! If you permit us to protect, keep, read, recite and copy this sutra, and make offerings to it strenuously in this Saha-World after your extinction, we will [do so, and] expound it in this world.

Thereupon the Buddha said to those Bodhisattva-mahasattvas:

No, good men! I do not want you to protect or keep this sutra because there are Bodhisattva-mahasattvas sixty thousand times as many as the sands of the River Ganges in this Saha-World. They are each accompanied by attendants also numbering sixty thousand times as many as the sands of the River Ganges. They will protect, keep, read, recite and expound this sutra after my extinction.

The Daily Dharma from July 29, 2016, offers this:

The Buddha makes this declaration to the uncountable number of Bodhisattvas who came from other worlds to hear him teach in Chapter Fifteen of the Lotus Sūtra. These Bodhisattvas had responded to the Buddha’s question of who would keep and expound the Buddha’s highest teaching after his death. They promised that they would remain in this world of conflict and fulfill the Buddha’s request. After the Buddha spoke these words, an unimaginable number of Bodhisattvas came up from underground and paid their respects to the Buddha. We can understand this story, and this image, as showing that our capacity for enlightenment, and our ability to benefit all beings, is already within us. We do not need an outside agent to give these to us.

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