大乘起信論裂網疏 2.34

2.34

Question: The essence of the ālaya is tathatā, and the ālaya can subsume all dharmas; since tathatā in its entire essence becomes the ālaya, tathatā should also produce all dharmas. Answer: The principle is indeed so. However, when viewed in terms of being immutable yet according with conditions, it is called tathāgatagarbha and is also called ālaya; therefore it may be said to produce all dharmas. If viewed in terms of according with conditions yet immutable, it is called tathatā; it can only be said to subsume all dharmas, all being non-arising and non-ceasing, and cannot be said to produce all dharmas.