瑜伽論記 1.412

1.412

又感成器等者，謂能感外器業，定引一劫，不增不減，一切眾生共業招故，內死不然。由種種業壽命不定，各別業感，業盡壽亡，便任運死。

Moreover, regarding "evoking the formation of the receptacle..." and so forth, it means that the karma capable of evoking the external receptacle definitely extends for one kalpa, neither increasing nor decreasing, because it is brought about by the collective karma of all sentient beings. Internal death is not like this. Due to diverse karmas, lifespans are indefinite; being evoked by individual karmas, when karma is exhausted and life ends, one naturally dies.