Day 12 concludes Chapter 7, The Parable of the Magic City, and completes the Third Volume of the Sutra of the Lotus Flower of the Wonderful Dharma.

Having last month learned that the sixteen Bodhisattva­ sramaneras each became a Buddha, we learn what became of the many hundreds of thousands of billions of living beings taught by each of the sramaneras.

“Bhikṣus! When we were śramaṇeras, we each taught many hundreds of thousands of billions of living beings, that is, as many living beings as there are sands in the River Ganges. Those living beings who followed me, heard the Dharma from me in order to attain Anuttara-samyak-saṃbodhi. Some of them are still in Śrāvakahood. I now teach them the Way to Anuttara-samyak-saṃbodhi. They will be able to enter the Way to Buddhahood by my teaching, but not immediately because the wisdom of the Tathāgata is difficult to believe and difficult to understand. Those living beings as many as there are sands in the River Ganges, whom I taught [ when I was a śramaṇera], included you bhikṣus and those who will be reborn as my disciples in Śrāvakahood after my extinction. My disciples who do not hear this sūtra or know the practices of Bodhisattvas, after my extinction will make a conception of extinction by the merits they will have accumulated by themselves, and enter into Nirvāṇa as they conceive it. At that time I shall be a Buddha of another name in another world. Those who will enter into Nirvāṇa as they conceive it will be able [to be reborn] in the world I shall live in, seek the wisdom of the Buddha, and hear this sūtra. They will be able to attain [true] extinction only by the Vehicle of the Buddha in that world because there is no other vehicle except when the Tathāgatas expound the Dharma with expedients.

“Bhikṣus! I will collect Bodhisattvas and Śrāvakas and expound this sūtra to them when I realize that the time of my Nirvāṇa is drawing near, that the living beings have become pure in heart, that they can understand the truth of the Void by firm faith, and that they have already entered deep into dhyāna-concentration. No one in the world can attain [true] extinction by the two vehicles. [True] extinction can be attained only by the One Buddha-Vehicle.

“Bhikṣus, know this! I can enter skillfully deep into the natures of all living beings. Because I saw that they wished to hear the teachings of the Lesser Vehicle and that they were deeply attached to the five desires, I expounded the teaching of Nirvāṇa to them. When they heard that teaching, they received it by faith.

The Introduction to the Lotus Sutra offers this:

[Chapter 7, The Parable of a Magic City,] has two distinct parts. The first is a story of the previous existence of a Buddha called Great-Universally-Excelling-Wisdom. The second consists of the parable for which this chapter is named, “The Magic City.” The concept of previous existences is a fundamental teaching in Buddhism. Its rationale is that there must be some prior meaning or conditions before something else can come into existence. (Nothing comes from nothing, and nothing takes place without a cause.) The story of a previous life here refers to a particular incident in the past which has led to the emergence of a present situation—that is, the origin of things. In the Lotus Sutra, Sakyamuni is said to employ three methods of expounding the law: logical explanations, parables, and stories of previous lives.