首楞嚴義疏注經 4.593

4.593

佛問阿難：「汝云何聲？云何無聲？」阿難、大眾俱白佛言：「鍾聲若擊，則名有聲；擊久聲消音響雙絕，則名無聲。」

The Buddha asked Ānanda: "Why do you [say there is] sound, and why do you [say there is] no sound?" Ānanda and the great assembly together addressed the Buddha, saying: "When the bell is struck, then it is called 'there is sound'; when struck long ago and the sound subsides, both tone and reverberation having ceased, then it is called 'there is no sound.'"