大乘起信論義記 2.170

2.170

此本覺用與眾生心本來無二，但不覺隨流，用即不現；妄心厭求，用則於彼心中稱根顯現，而不作意我現差別，故云隨根自然相應。雖不作意，現無不益，故云種種而現得利益故也。上來隨染本覺之相竟。

This function of innate enlightenment and the minds of sentient beings are fundamentally non-dual. However, when non-enlightenment follows the flow, the function does not appear; when the false mind feels revulsion and seeks [enlightenment], the function then manifests in their minds according to their capacities, without intentionally thinking 'I manifest distinctions.' Therefore, it says: 'naturally responding according to capacities.' Although it does not intentionally think, among its manifestations there is none that does not benefit; therefore, it says: 'manifesting in various ways so that they obtain benefit.' Up to this point, the explanation of the marks of innate enlightenment following defilement is finished.