成唯識論演祕 2.96

2.96

答：五雖有法，亦名所立，故如《瑜伽》：「云何所立有二，謂自性、差別理門？」亦云；「但由法故成於法。」如是成立於有法。

Answer: Although the five are the subject, they are also called what is to be proved (sādhya). Hence, as the Yogācārabhūmi states: "How are there two kinds of what is to be proved? They are self-nature and distinction." The Nyāyamukha also states: "Only by virtue of the predicate is the predicate established; in this way is the subject established."