首楞嚴義疏注經 2.365

2.365

既非自然，必是因緣。因緣之義無常生滅，此有彼無，體非周遍，豈同覺性湛然常住、圓滿十方？行相相違，故云云何合因緣性。

Since it is not spontaneity, it must be causes and conditions. The principle of causes and conditions is impermanent arising and ceasing—here existent, there non-existent, its substance not all-pervasive. How could it be identical to the nature of awareness, serene, permanently abiding, and filling the ten directions? Their characteristics conflict; hence [Ānanda] asked, "How does it accord with the nature of causes and conditions?"