大乘起信論裂網疏 4.107

4.107

有為、無為既不成就，則十方世界更有何法可成就耶！此則生滅無性，當體即是真如明矣。初正示觀門竟。

Since conditioned and unconditioned are both unestablished, then what phenomenon in the worlds of the ten directions could possibly be established! Here it is clear that arising and ceasing have no intrinsic nature, and their very substance is tathatā. The first part, directly indicating the approach of contemplation, is concluded.