首楞嚴義疏注經 8.593

8.593

此之六天身有光明，飛行自在，壽命長遠，漸增漸勝，不同下之人趣，故云形雖出動。又人趣雜類壽命短促，遷變不常，天之福命卒難搖動，故云出動。尚有欲境相遘，故云心跡尚交。若至定地，永無欲對矣。

The beings of these six heavens have radiant bodies, fly freely, and have prolonged lifespans, gradually increasing and becoming more superior, unlike the lower human destiny; hence it is said, "although their forms transcend bodily movement." Moreover, the mixed beings of the human destiny have short lifespans, constantly shifting and changing, whereas the merit and lifespan of devas are difficult to shake suddenly; hence it is said, "transcend bodily movement." Because there is still the encounter with realms of desire, it is said, "the traces of their minds still intermingle." When one reaches the stages of meditative absorption, there is permanently no facing of desire.