瑜伽師地論分門記 1.47

1.47

分十八中第二明欲界四空居天器世成立相分四。一立生起。二明成相。三立喻。四明四空居天生之因由。

Within the eighteen parts, the second, explaining the characteristics of the formation of the receptacle world of the four space-dwelling devas of the desire realm, has four parts: 1. establishing their arising; 2. explaining the characteristics of their formation; 3. establishing a simile; 4. explaining the reasons for the birth of the four space-dwelling devas.