大方廣圓覺修多羅了義經 1.27

1.27

"Kulaputra, it is like smelting gold ore: the gold does not exist because of the smelting. Once it has become gold, it does not become ore again; even through inexhaustible time, the nature of the gold is not destroyed. One should not say that it was originally unaccomplished. The Tathāgata's perfect enlightenment is also like this. Kulaputra, the marvelous, perfect enlightenment mind of all Tathāgatas originally has neither bodhi nor nirvāṇa, nor does it have becoming a buddha or not becoming a buddha, nor does it have false transmigration or non-transmigration.