Day 13 covers all of Chapter 8, The Assurance of Future Buddhahood of the Five Hundred Disciples.

Having last month heard Śākyamuni praise Pūrṇa as the most excellent expounder of the Dharma, we learn of Pūrṇa’s future.

“Bhikṣus! Pūrṇa was the most excellent expounder of the Dharma under the seven Buddhas. He is the same under me. He will be the same under the future Buddhas of this Kalpa of Sages. He will protect the teachings of those Buddhas and help them propagate their teachings. After the end of this kalpa also he will protect the teachings of innumerable Buddhas, help them propagate their teachings, teach and benefit innumerable living beings, and cause them to aspire for Anuttara-samyak-saṃbodhi. He will always make efforts to teach all living beings strenuously so that the worlds of those Buddhas may be purified. He will perform the Way of Bodhisattvas step by step for innumerable, asaṃkhya kalpas, and then attain Anuttara-samyak-saṃbodhi in this world. He will be called Dharma-Brightness, the Tathāgata, the Deserver of Offerings, the Perfectly Enlightened One, the Man of Wisdom and Practice, the Well-Gone, the Knower of the World, the Unsurpassed Man, the Controller of Men, the Teacher of Gods and Men, the Buddha, the World-Honored One. The world of that Buddha will be composed of one thousand million Sumeru-worlds, that is, as many Sumeru-worlds as there are sands in the River Ganges. The ground [of that world] will be made of the seven treasures. It will be as even as the palm of a hand. There will be no mountains nor ravines nor ditches. Tall buildings adorned with the seven treasures will be seen everywhere in that world, and the palaces of gods of that world will hang so low in the sky that gods and men will be able to see each other. There will be no evil regions nor women. The living beings of that world will be born without any medium. They will have no sexual desire. They will have great supernatural powers, emit light from their bodies, and fly about at will. They will be resolute in mind, strenuous, and wise. They will be golden in color, and adorned with the thirty-two marks. They will feed on two things: the delight in the Dharma, and the delight in dhyāna. There will be innumerable, asaṃkhya Bodhisattvas, that is, thousands of billions of nayutas of Bodhisattvas. They will have great supernatural powers and the four kinds of unhindered eloquence. They will teach the living beings of that world. There will also be uncountable Śrāvakas there. They will have the six supernatural powers including the three major supernatural powers, and the eight emancipations. The world of that Buddha will be adorned with those innumerable merits. The kalpa [in which Pūrṇa will become that Buddha] will be called Treasure­Brightness; and his world, Good-Purity. The duration of the life of that Buddha will be innumerable, asaṃkhya kalpas, and his teachings will be preserved for a long time. After his extinction, stupas of the seven treasures will be erected [in his honor] throughout that world.”

Underscrore “He will always make efforts to teach all living beings strenuously so that the worlds of those Buddhas may be purified. He will perform the Way of Bodhisattvas step by step for innumerable, asaṃkhya kalpas, and then attain Anuttara-samyak-saṃbodhi in this world.”