妙法蓮華經玄贊 2.117

2.117

出體者，六趣皆以第八異熟識而為自體，無覆無記性攝，故《唯識》云「此第八識是界、趣、生，施設本故」。又云「此識足為界、趣、生體，無勞別執有實命根」。又有情流轉五趣、四生，然趣、生之體即異熟識故。

Regarding pointing out the essential nature: all six destinies have the eighth, the maturation consciousness (vipāka-vijñāna), as their own-nature, which is subsumed under the non-obscured indeterminate nature. Therefore the Vijñaptimātratā[siddhi] says: 'This eighth consciousness is the basis for positing realms, destinies, and births.' It also says: 'This consciousness suffices as the substance of realms, destinies, and births; there is no need to postulate separately a real life-faculty.' Furthermore, sentient beings transmigrate through the five destinies and four modes of birth, and the substance of destinies and births is precisely the maturation consciousness.