大乘起信論義記 3.183

3.183

In the brief explanation, an objection is raised: "Since it is non-dual, why speak of differentiation?" The explanation states: Relying on the defiled dharmas [as numerous as] the sands of the Ganges in the marks of the consciousness of arising and ceasing, by contrast with this the differentiation of the pure virtues [as numerous as] the sands of the Ganges in tathatā is demonstrated. And because the root of these defilements is cited first, it speaks merely of the karmic consciousness.