俱舍論疏 7.58

7.58

論「有謂至於無為」，答也。「自性於自性」者，此無六因、四緣用也。「於他性亦有，謂有為於無為、無為於無為」者，四緣與生法為緣。無為無生，所以有為望無為、無為望無為，非四緣也。

On the Śāstra's statement: "There is, namely ... in relation to the unconditioned": this is the answer. As for "its own nature in relation to its own nature", this lacks the function of the six causes and four conditions. As for "there are also cases in relation to other natures, namely conditioned dharmas in relation to unconditioned dharmas, and unconditioned dharmas in relation to unconditioned dharmas", the four conditions serve as conditions for dharmas that arise. The unconditioned has no arising; therefore, conditioned dharmas looking toward unconditioned dharmas, and unconditioned dharmas looking toward unconditioned dharmas, are not the four conditions.