起信論疏筆削記 13.40

13.40

從後向前者，取其文勢相躡，故逆次前三，是乃自本之末以略標，從末向本以廣釋也。

Regarding "from back to front": this adopts the flow of the text stepping backward into one another, hence reversing the order of the previous three; this briefly indicates [the process] from root to branch, and extensively explains it from branch back to root.