成唯識論述記 2.227

2.227

第四、破外伏難。外人問曰：若無得者，未得者未得已失，及無為法應永不成。

Fourth, refuting the opponent's latent objection. The opponent asks: If there is no prāpti, then what has not yet been acquired, what was not yet acquired and already lost, and unconditioned phenomena would never be possessed.