妙法蓮華經玄義 2.128

2.128

無量者，迷中重故，從事得名。苦有無量相，十法界果不同故。集有無量相，五住煩惱不同故。道有無量相，恒沙佛法不同故。滅有無量相，諸波羅蜜不同故。《大經》云：「知諸陰苦，名為中智。分別諸陰，有無量相，非諸聲聞、緣覺所知。我於彼經，竟不說之。」三亦如是。是名無量四聖諦。

"Immeasurable" [truths]: because delusion regarding the middle is heavy, it receives its name from phenomena. Suffering has immeasurable marks, because the fruits of the ten dharma realms are not the same. Accumulation has immeasurable marks, because the afflictions of the five entrenchments are not the same. The path has immeasurable marks, because the buddha-dharmas [as numerous as] the sands of the Ganges are not the same. Cessation has immeasurable marks, because the various pāramitās are not the same. The Great Sūtra states: "Knowing the suffering of the aggregates is called intermediate wisdom. Distinguishing the aggregates as having immeasurable marks is not what is known by śrāvakas and pratyekabuddhas. In that sūtra I did not expound it at all." The other three are also like this. These are named the immeasurable four noble truths.