俱舍論記 6.149

6.149

「唯有為法至無五果故」者，答。唯有為法，有六因、有五果，非諸無為。所以者何？無為體常，無六因生故、無得五果故。

Regarding 'Only conditioned dharmas […] because they lack the five results': this is the reply. Only conditioned dharmas possess the six causes and possess the five results, not the unconditioned [dharmas]. Why? The essence of the unconditioned is eternal; because it is not generated by the six causes, and because it does not obtain the five results.