仁王護國般若經疏 2.7

2.7

「非斷非常」者，三歎德也。過去二因牽識等故非斷，識等滅故三因不生故非常。又三世相續故非斷，無自性故非常。又順則生死無際故非斷，逆則無明燋竭故非常。

"Neither annihilated nor eternal" is the third, praising their virtues. Because the two causes of the past drag consciousness and so forth along, it is not annihilated; because consciousness and so forth cease, the three causes do not arise, hence it is not eternal. Moreover, because the three periods of time are continuous, it is not annihilated; because it lacks intrinsic nature, it is not eternal. Furthermore, in forward order, birth-and-death is boundless, hence not annihilated; in reverse order, ignorance is scorched and exhausted, hence not eternal.