大乘起信論義記 2.221

2.221

Third, as for "the mark of grasping attachment": toward the preceding objects of suffering, pleasure, and so on, failing to understand their emptiness and non-existence, it deeply gives rise to grasping attachment. Hence the text below says: "This very continuing consciousness, based on ordinary beings' grasping attachment growing deeper, grasps the self, what belongs to the self," and so forth. The words "based on continuation... suffering and pleasure" refer to the preceding mark of continuation. "The mind gives rise to attachment" is this mark of grasping attachment.