淨名經集解關中疏 2.424

2.424

勸請說法隨喜讚善。得佛音聲身口意善。得佛威儀　此大士之德也。佛音者經云八音也。一徹好。二柔軟。三和適。四諦了。五不女。六不誤。七深遠。八不竭也。又密跡經云。有無量音也。

"Beseeching [the Buddhas] to preach the Dharma, rejoicing in and praising the good, they attain the Buddha's voice, the goodness of body, speech, and mind, and attain the Buddha's deportment." These are the virtues of the mahāsattva. The Buddha's voice refers, as the sūtra says, to the eight tones of voice: first, penetrating and beautiful; second, soft and pliable; third, harmonious and fitting; fourth, clear and distinct; fifth, not feminine; sixth, not erroneous; seventh, deep and far-reaching; eighth, inexhaustible. Furthermore, the Guhyakādhipati-sūtra says it has limitless tones of voice.