Thereupon the World-Honored One said to Mahā-Kāśyapa and other great disciples: “Excellent, excellent! {well-done}

As four great voice hearers had achieved enlightenment by the first parable, subsequently they spoke of their faith and understanding, in order to express their enlightenment. Understanding had to be verified, [and it turned out that] they had comprehended in depth the Sage’s idea of first the three and later the One. Because they comprehended the purport of what the Sage was driving at, in this chapter the Buddha confirms the propriety of what they have said in order to perfect the meaning [of the doctrine]. Hence, he praised [them] saying, “well-done!” commending their rare achievement. [The Buddha] secretly guided them, undetected, making them equal with Kāśyapa [in understanding].

The title “Medicinal Herbs” conveys, the fact that in the past they had received and maintained the Sage’s teaching, and as the Sage’s teaching soaked their spirit, the disease of depravities (kleśa) was cured. Thus [the transmitter of the sūtra] used the [the words] medicinal herbs in titling the chapter.