The Surangama Sutra: Twenty-Five Means to Enlightenment, Session Six, Part 5 of 7 April 8, 2019

He said to Ananda personally, “Ananda, you should listen attentively: I rely upon the Budddha’s awesome power, in describing to you the Vajra King, A samadhi inconceivable of likeness to illusions. It is the true mother of all Buddhas. You may hear the secret Dharma-doors, of Buddhas as numerous as motes of dust, But without first renouncing desire and outflows, You may amass learning, but you will still make mistakes. You concentrate on learning to uphold the Buddha’s Dharma, why don’t you listen to your own hearing? …As soon as one sense-organ returns to the Source, The entire six organs are liberated.” So, using the hearing organ, the true hearing organ, you can liberate all the other six organs. I guess after that, the Buddha felt that it was time to impart to him the Quan Yin Method to protect him. Because if you practice this Quan Yin Method to the full, then even Matangi’s daughter, you will see it as just an illusionary figure or dreamlike, so you will not be charmed by any mantra, even the most powerful one. You will counteract it with that and no problem, you will be free. That’s what he meant.