華嚴經探玄記 1.34

1.34

First, Bodhiruci of the Later Wei established the teaching of the single sound, asserting that all holy teachings are solely the Tathāgata's teaching of one perfect sound, which is only divided into various kinds according to differences in faculties, as in the sūtra, 'nourished by a single rain,' etc. Also, a sūtra states: 'The Buddha proclaims the Dharma with a single sound, and sentient beings each attain understanding according to their kind,' etc.