俱舍論頌疏論本 10.82

10.82

二無記涅槃者，入涅槃心唯二無記，謂異熟生及威儀路。唯無記心入涅槃者，無記勢力微，順心斷滅故，工巧稍強，通果定發，雖是無記，不入涅槃。

"Nirvāṇa is entered through two non-defined [consciousnesses]" means that the mind entering nirvāṇa is only twofold non-defined: maturation-born and modes of deportment. Entering nirvāṇa is only with a non-defined mind because the force of the non-defined is weak, which accords with the cessation of mind; technical dexterity is somewhat strong, and the fruit of supernormal knowledge is triggered by absorption, so although they are non-defined, one does not enter nirvāṇa through them.