大乘起信論裂網疏 4.68

4.68

This reveals the own-essence and attributes of the Mahāyāna. Since the minds of all sentient beings originally possess the essence of tathatā, they also originally possess the attributes of tathatā; these do not wait until one attains Buddhahood to exist, so they are called the own-essence and attributes of tathatā. "Neither identical nor different": in terms of overturning defilement with differentiations, they are not identical; in terms of being solely the one tathatā, they are not different. Because the essence of tathatā originally possesses such real virtuous attributes, in terms of ordinary people who use it daily without knowing, it is merely called the tathāgatagarbha; in terms of the Buddhas who have emerged from obstacles and are fully illuminated, it is re-named the dharmakāya. The first part, correctly revealing, is finished.