止觀輔行傳弘決 1.81

1.81

次「若心若道」下，舉略顯廣以要攝多。一道之內非相無邊，故云「甚多」。「或開上合下」等者，明開合。上謂二乘、下謂修羅，文合二乘，是故開下，謂開修羅從鬼畜出。開上合下準說可知。《法華》云六趣、《淨名》云五道，以由修羅開合故也。十是數方，意如前說。

Next, from "whether mind or path" onwards, he adduces the brief to reveal the broad, grasping the many by means of the essential. Within a single path, the marks of error are boundless; hence he says "very many." Regarding "sometimes opening the upper and combining the lower," etc., this explains the opening and combining. The "upper" refers to the two vehicles; the "lower" refers to the asuras. The text combines the two vehicles, and therefore opens the lower, meaning it opens the asuras out from the ghosts and beasts. Opening the upper and combining the lower can be understood following this explanation. The Lotus speaks of six destinies, and the Vimalakīrti speaks of five paths, precisely because of opening or combining the asuras. "Ten" is a directional number, the intent of which is as explained before.