大乘起信論義記 3.125

3.125

The answer says: Tathatā is originally one, yet there is immeasurable and boundless avidyā, which from the beginning has differences in its own nature, being thick or thin. Afflictions more numerous than the sands of the Ganges arise in variation based on avidyā; the afflictions of view of self and affection-defilement arise in variation based on avidyā. All such afflictions arise based on avidyā with immeasurable differences in being prior and posterior, which only the Tathāgata can know.