俱舍論記 18.130

18.130

「若有六因至非最輕重」者，若有六因皆是上品，此業最重；翻此六種，餘業最輕。除此重輕中間諸業，非最輕重。

Regarding "If the six causes... not the most light or heavy": if the six causes are all of the superior grade, this action is the heaviest; opposite to these six, the remaining action is the lightest. Actions intermediate between this heaviness and lightness are neither the most light nor the most heavy.