注大乘入楞伽經 4.29

4.29

It means that functioning as mutual marks of fruit in an unbroken succession is called the mutual cause. The Abhidharmasamuccaya states: 'Co-existent [causes] are mutual fruits, just as great elements and that which is characterized by them, or mind and mental concomitants.' This means conditioned marks with respect to conditioned phenomena, conditioned phenomena with respect to conditioned marks; the mind with respect to dharmas concomitant with the mind, and dharmas concomitant with the mind with respect to the mind, because they are mutual fruits, this is also called the co-existent cause.