菩薩從兜術天降神母胎說廣普經 2.10

2.10

"Through countless asaṃkhyeya eons, I cultivated dhāraṇī Dharma gates that are indestructible: hearing one and obtaining a hundred, hearing a hundred and obtaining a thousand, hearing a thousand and obtaining ten thousand; the meanings of sentences and the meanings of letters spoken by all buddhas are all retained in dhāraṇī and never forgotten. This is called the bodhisattva-mahāsattva's accomplishment of the dhāraṇī Dharma gate.