俱舍論疏 23.178

23.178

論「彼從此後至所說如是」，釋七生也。理實人、天各七為十四生，各加中有為二十八，各七等故名為七生。如七處善，五蘊各七，有三十五處，但名七處以數等故。如七葉樹，別別七故，非唯七葉。

On the passage of the treatise from "From this point forward, they" to "what has been stated is thus": This explains the seven rebirths. In truth, seven each in the human and heavenly realms make fourteen births; adding intermediate existence to each makes twenty-eight. Because each has seven equally, it is called 'seven births'. Just as in the seven stations of skillfulness, the five skandhas each have seven, totaling thirty-five stations, yet it is simply named 'seven stations' because the numbers are equal. Like the *saptaparṇa* tree, because each separate part has seven leaves, it is not merely seven leaves in total.