仁王般若經疏 3.64

3.64

白佛下，正問。就中有二：初正問所說般若甚深無量；次云何下，結問意。就前正問中有三句歎般若甚深：一過言說，故云不可說，言語道斷故；二過相心境界，故言不可解，深而無盡故；三過覺觀，故云不可以識識，非思慮境界，非緣慮之所達也；云何下，次結問意，法相如是絕緣忘觀，云何解了，令一切眾生得入空道？開空法道者，達有本空，故名開空。即空能通名道，故云開空法道也。

"He addressed the Buddha..." onwards is the main question. Within this there are two [parts]: First, he directly asks about the profound and immeasurable nature of the prajñā that was preached; second, from "How..." onwards, he concludes the intent of the question. In the preceding direct question there are three clauses praising the profundity of prajñā: First, it surpasses words, hence it is said to be "ineffable," because the path of words is cut off; second, it surpasses the realm of conceptual thought, hence it is said to be "incomprehensible," because it is deep and inexhaustible; third, it surpasses discursive reflection, hence it is said that it "cannot be known by consciousness," as it is not an object of discursive thought and cannot be reached by cogitation. From "How..." onwards, he next concludes the intent of the question: the nature of dharmas being thus, severing conditions and discarding contemplation, how can one comprehend it so as to enable all sentient beings to enter the path of emptiness? To "open up the path of the Dharma of emptiness" means that by realizing that existence is fundamentally empty, it is called "opening up emptiness." Empty as such can lead through, which is called "path"; hence it is said to "open up the path of the Dharma of emptiness."