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

Having last month considered the reasons for the Buddha’s various teachings, we consider the Buddha’s nirvana.

“Good men! The duration of my life, which I obtained by the practice of the way of Bodhisattvas, has not yet expired. It is twice as long as the length of time as previously stated. Although I shall never enter into Nirvāṇa, I say to men of little virtue, ‘I shall pass away.’ I teach them with this expedient. Why is that? It is because, if they see me for a long time, they will not plant the roots of good, but become poor and base, and cling to the five desires so much that they will be caught in the nets of wrong views. If they think that I am always here, and do not think that I will pass away, they will become too arrogant and lazy to realize the difficulty of seeing me, and they will not respect me. Therefore I say [to them] expediently, ‘Bhikṣus, know this! It is difficult to see a Buddha who appears in [this] world.’ Why is that? It is because some men of little virtue cannot see me even during many hundreds of thousands of billions of kalpas while the others can. Therefore, I say [to them], ‘Bhikṣus! It is difficult to see a Tathāgata.’ Those who hear this and know that it is difficult to see me, will adore me, admire me, and plant the roots of good. Therefore l say [to them], ‘I shall pass away,’ although I shall not.

“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.

The Daily Dharma from Feb. 5, 2023, offers this:

Although I shall never enter into Nirvāṇa, I say to men of little virtue, ‘I shall pass away.’ I teach them with this expedient. Why is that? It is because, if they see me for a long time, they will not plant the roots of good, but become poor and base, and cling to the five desires so much that they will be caught in the nets of wrong views.

The Buddha gives this explanation in Chapter Sixteen of the Lotus Sutra. This Chapter is the first time he reveals himself as the Ever-Present Buddha who became enlightened in the far distant past and will continue to lead all beings to enlightenment into the far distant future. The Buddha uses the death of his physical body as an expedient so that those who take him for granted will make efforts to practice his teachings. When we practice the Wonderful Dharma of the Lotus Sūtra, then we learn to see the Buddha in ourselves and all beings.

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