“Avalokiteshvara Buddha [Quan Yin], the hearer and answerer of prayer, has visited all the Buddha-lands of the ten quarters of the universe and has acquired transcendental powers of boundless freedom and fearlessness and has vowed to emancipate all sentient beings from their bondage and suffering. How sweetly mysterious is the Transcendental Sound of Avalokiteshvara! Is is the subdued murmur of the sea-tide setting inward. Its mysterious Sound brings liberation and peace to all sentient beings who in their distress are calling for aid.” (Surangama Sutra, Buddhist Scripture)
“Ananda and all you who listen here
Should inward turn your faculty
Of hearing to hear your own nature
Which alone achieves Supreme Bodhi.
That is how enlightenment is won.
Buddhas as many as the Ganges’ sand
Entered this one gateway to Nirvana.
All past Tathagathatas
Have achieved this method.”
“It is easiest to hear this Sound when it is quiet, particularly at nighttime. Once you have identified this Sound, then you place your awareness on it without wavering. Resting your mind in the Sound, you continue to listen, going further and further into the Sound itself.” (Mind Beyond Death, Dzogchen Ponlop Rinpoche)
“Listening to the inner Sound brings the heart into a position of acute inner awareness. It is not that the inner Sound has some magical property. Rather, it is that bringing of the alert mind, bringing openness and receptivity to Sound, is symbolic of the presence of Ultimate Truth. The Sound is always there. We don’t have to create it. It is featureless. It is ever present. So it is a good symbol for Ultimate Reality itself.” (Ajahn Amaro)