法華玄論 7.60

7.60

Answer: There are both sameness and difference. As for the difference: the intent behind the cloud and rain is as distinguished in the causes and conditions for expounding the sūtra. Here we briefly raise two points: first, it takes being without mind yet able to benefit universally; second, it wishes to reveal the identical correct path becoming different according to faculties. As for the single voice: it wishes to clarify that the Tathāgata's three mysteries are inconceivable, and cannot be fathomed by ordinary beings or the two vehicles. Why is this? A person of a lower stage can only use a single sound to cause [those with] conditions to hear the same one thing together; they cannot use a single voice to cause myriad kinds to hear differently. Only the Buddha is able to do so, and hence it is called the inconceivable mystery of speech.