大乘起信論義疏 1.80

1.80

自下第三引說證成，此中有二：一者正證非究竟；二者「又心起」下，證究竟覺。「是故修多羅說」者，是《楞伽經》也。「能觀無念」者，七識緣智名為念也。無七識念，「為向佛智」也。此是上中證非竟覺也。「又心起者」，是真始覺心也。無初相即謂無念者，以始覺起時，一切妄法無有可知。而言知者，無念為知。此之證究竟覺也。

Next below, the third part cites scriptural teaching to corroborate and establish [this], in which there are two parts: first, directly corroborating that it is non-ultimate; second, from 'Moreover, when the mind arises' below, corroborating ultimate enlightenment. Regarding 'Therefore a sūtra says,' this refers to the Laṅkāvatāra Sūtra. Regarding 'being able to contemplate thoughtlessness,' the conditioned wisdom of the seventh consciousness is called 'thought'; being free from the thoughts of the seventh consciousness 'is heading toward the Buddha's wisdom.' This is what corroborates above that it is not ultimate enlightenment. Regarding 'Moreover, when the mind arises,' this is the true mind of initial enlightenment. To have no initial mark means thoughtlessness, because when initial enlightenment arises, there are no deluded phenomena that can be known. Yet as for saying that it knows, it takes thoughtlessness as knowledge. This corroborates ultimate enlightenment.