大乘起信論義記 2.59

2.59

"Non-empty" has two senses: 1. Different from delusion which lacks substance, hence called "possessing intrinsic substance." 2. Different from the defilements as numerous as the sands of the Ganges, hence called "fully endowed with undefiled virtues of its nature." Therefore the Mahāyānasaṃgraha says: "The four virtues are fundamentally present." A verse in the Buddhagotrasūtra says: "Because adventitious defilements are empty, they are separate from the dharmadhātu; the unsurpassable Dharma is not empty, and accompanies the dharmadhātu." The extensive explanation in its prose commentary can be known from that.