三彌勒經疏 1.67

1.67

經曰「說此陀羅尼已」以下，第三得利。約實所餘眾生亦得益，而彌勒最勝故，不說餘眾生也。問：何故彌勒集眾中不列？答：波離、慶喜在眾中而不列，是等皆舊眾故不列也。坐起者，表所得定。整衣服者，表四威儀，以七支戒德滿故。叉手合掌者，表心與境冥理而神會，是照真俗智滿故。住立佛前者，表證三昧故其心不動。

From the sūtra's words "Having spoken this dhāraṇī..." downward is the third [part], obtaining benefit. In reality, the remaining sentient beings also gained benefit, but because Maitreya was supreme, other sentient beings are not mentioned. Question: Why was Maitreya not listed among the gathered assembly? Answer: Upāli and Ānanda were also in the assembly and yet not listed; these were all part of the old assembly, and therefore not listed. "Arising from his seat" symbolizes the samādhi he attained. "Adjusting his robes" symbolizes the four postures, because his virtuous conduct regarding the seven actions was perfected. "Joining his palms" symbolizes his mind harmonizing with the object and spiritually merging with principle, which is the perfection of wisdom that illuminates both the ultimate and the conventional. "Standing before the Buddha" symbolizes that his mind is unmoving because he has realized samādhi.