妙法蓮華經文句 7.23

7.23

下地以一音令他聞一法，佛以一音隨類各解；今一雲一雨，正是隨類之一音也。有人解，法身不二名一，從法身出音故言一音。有人言，一時並出眾聲故言一音。有人言，五音之中隨用一音。《大論》明一音報眾聲，不言並出，亦不言是法身出音。《毘婆沙》言，佛以一音說四諦，五人聞人語，八萬諸天聞天語，地獄夜叉各聞同其語，唱告至梵天是為梵音，亦是佛報得清淨音聲最妙號為梵音，若報得梵音，則人所不聞、聞亦不解。

On lower stages, by means of a single voice one causes others to hear a single teaching; the Buddha, by means of a single voice, causes each to understand according to their kind. Now, the single cloud and single rain are precisely this single voice that accords with kind. Some explain that the non-duality of the dharmakāya is called 'single', and because the sound issues from the dharmakāya it is called 'single voice'. Some say that because all sounds are emitted simultaneously, it is called 'single voice'. Some say that among the five tones, he employs any single tone at will. The Mahāprajñāpāramitā-upadeśa explains that a single voice responds to many sounds, not that they are emitted simultaneously, nor that it is a sound issuing from the dharmakāya. The Vibhāṣā says that the Buddha preaches the Four Truths with a single voice: five people hear human speech, eighty thousand devas hear divine speech, and hell-beings and yakṣas each hear their own corresponding speech; its proclamation reaching up to the Brahmā heaven is the brahma-voice. It is also that the pure voice obtained by the Buddha as karmic reward is most sublime and styled the brahma-voice; if it were the brahma-voice obtained as karmic reward, then humans would not hear it, and even if they heard it, they would not understand it.