瑜伽論記 1.476

1.476

文云：壽盡故者，彼天分限命盡。業盡故者，不滿天壽業力盡故。福盡故，耽定味等，便捨命故。二禪、三禪雖有初生，以無尋伺更無希望，以無諂誑亦無君臣，初定皆有故，有大梵起希望念也。按文相也，即說隨造宮成眾生即住，不待總成方布人住。

The text states: 'Because their lifespan is exhausted' means the fixed term of life in that heaven has ended. 'Because their karma is exhausted' means the karmic force has ended before completing the heavenly lifespan. 'Because their merit is exhausted' means that clinging to the taste of concentration, they cast off their lives. Although there is first birth in the second and third dhyānas, because there is no investigation or reflection, there is no further yearning, and because there is no flattery or deceit, there are also no rulers and ministers; in the first dhyāna both are present, hence Mahābrahmā gives rise to thoughts of yearning. According to the text's sense, it means that as each palace is formed, sentient beings immediately inhabit it; it does not wait for complete formation before placing people to live there.