Day 3 covers the first half of Chapter 2, Expedients.

Today begins the “big reveal.” Śāriputra, foremost in wisdom, discovers he’s not so smart after all.

In short, the Buddhas attained the innumerable teachings which you have never heard before. No more, Śāriputra, will I say because the Dharma attained by the Buddhas is the highest Truth, rare [to hear] and difficult to understand.

And in gathas:

The Dharma cannot be shown.
It is inexplicable by words.
No one can understand it
Except the Buddhas
And the Bodhisattvas
Who are strong in the power of faith.

This revelation causes confusion, especially among those who thought they knew it all.

The great multitude at that time included Sravakas. [They also included] Ajinata-Kaundinya, and other Arhats, twelve hundred altogether, who had already eliminated asravas. [They also included] the bhiksus, bhiksunis, upasakas, and upasikas, [that is, the four kinds of devotees] who had already aspired for Sravakahood or Pratyekabuddhahood. All of them thought:

“Why does the World-Honored One extol so enthusiastically the power of the Buddhas to employ expedients? Why does he say that the Dharma attained by him, is profound and difficult to understand, and that the true purpose of his teachings is too difficult for Sravakas and Pratyekabuddhas to know? He expounded to us the teaching of emancipation. We obtained this teaching and reached Nirvana. We do not know why he says all this.”

And in gathas:

No one asks you about the Dharma you attained
At the place of enlightenment.
[The Dharma] is too difficult for me to measure.
[So it is for others; therefore,] no one asks you.

Although you are not asked, you extol the teachings
[Of the past Buddhas] which you practiced.
Your wisdom is wonderful.
It is the same wisdom that the other Buddhas obtained.

The Arhats-without-asravas
And those who are seeking Nirvana
Are now in the mesh of doubts, wondering:
“Why does the Buddha say all this?”

Having been here before and knowing where all this is going, I have a much better appreciation of what Sakyamuni is revealing. These guys know they’re not Buddhas and never considered asking how to become Buddhas. They have no idea what they’ve learned is only expedient used to help them free themselves enough to see that there is something more.

It’s no wonder that 5,000 people walk out when the Buddha finally accedes to Śāriputra’s request to explain himself. Their loss.

“Śāriputra! What is the one great purpose for which the Buddhas, the World-Honored Ones, appear in the worlds? The Buddhas, the World-Honored Ones, appear in the worlds in order to cause all living beings to open [the gate to] the insight of the Buddha, and to cause them to purify themselves. They appear in the worlds in order to show the insight of the Buddha to all living beings. They appear in the worlds in order to cause all living beings to obtain the insight of the Buddha. They appear in the worlds in order to cause all living beings to enter the Way to the insight of the Buddha. Sariputra! This is the one great purpose for which the Buddhas appear in the worlds.”

The Buddha said to Śāriputra:

The Buddhas, the Tathagatas, teach only Bodhisattvas. All they do is for one purpose, that is, to show the insight of the Buddha to all living beings, to cause them to obtain the insight of the Buddha.

Śāriputra! I also expound various teachings to all living beings only for the purpose of revealing the One Buddha-Vehicle. There is no other vehicle, not a second or a third. Śāriputra! All the present Buddhas of the worlds of the ten quarters also do the same.

And…

I know that all living beings have various desires. I also know that they have attachments deep in their minds. Therefore, I expound various teachings to them with stories of previous lives, parables, similes and discourses, that is to say, with various expedients according to their natures.

Śāriputra! I do all this for the purpose of causing them to realize the teaching of the One Buddha-Vehicle, that is, to obtain the knowledge of the equality and differences of all things. Śāriputra! There is not a second vehicle in the worlds of the ten quarters. How can there be a third?

The day ends with this:

“Sariputra and all of you present here! Understand the Dharma by faith with all your hearts! There is no vehicle other than the One Buddha-Vehicle.”