大乘起信論義記 3.84

3.84

非心智滅者，上文以對不覺故名為覺，則一識有二義。今以對癡故名為智，則一心有體相。不覺癡相轉滅成於始覺，本覺智體不滅，與還源無二無別也。上來釋染淨生滅因緣相竟。

'It is not that the cognition of the mind ceases': above, in contrast to non-enlightenment, it was called enlightenment, and so one consciousness has two meanings. Now, in contrast to delusion, it is called cognition, and so the One Mind has substance and marks. The marks of delusion of non-enlightenment turn and cease, becoming incipient enlightenment; the cognitive substance of innate enlightenment does not cease, and is non-dual and without difference from returning to the source. Thus far, the explanation of the marks of the causes and conditions of defiled and pure arising and ceasing is completed.