大般涅槃經集解 24.8

24.8

案僧亮曰：本有今無者，本有煩惱而無涅槃也。本無今有者，本無般若而有煩惱也。若謂佛三世皆有煩惱者，無有是處也。是故緣雖同而所以為異也，有煩惱故無常，無煩惱故有常。

Sengliang comments: "Originally existing and now non-existent" means originally having defilements and lacking nirvāṇa. "Originally non-existent and now existent" means originally lacking prajñā and having defilements. If one says that the Buddha has defilements in all three periods of time, there is no such possibility. Therefore, although conditions are the same, that by which they differ is this: because there are defilements, there is impermanence; because there are no defilements, there is permanence.