金剛般若經依天親菩薩論贊略釋秦本義記卷上 1.99

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經。佛告須菩提於意云何如來昔在燃燈佛所於法有所得不　自下斷第五疑也。此名菩薩得法疑。論敘疑云。釋迦如來昔於燃燈佛所授法。彼佛為此佛說法。若如是云何彼法不可取不可說。為斷此疑。經文有二。先問後答。此初問也。如來所以反問須菩提者。欲明佛及菩薩已證真如。真如法中豈取說耶。

[Sūtra:] "The Buddha told Subhūti: 'What do you think? Formerly, when the Tathāgata was with the Buddha Dīpaṅkara, did he attain anything in dharma?'"

Hereafter, the fifth doubt is resolved. This is called the doubt concerning the bodhisattva attaining dharma. The Treatise states the doubt, saying: "Śākyamuni Tathāgata formerly received dharma from the Buddha Dīpaṅkara, and that Buddha taught dharma for this Buddha. If so, why is that dharma ungraspable and unspeakable?" To resolve this doubt, the sūtra text has two [parts]: question first, followed by answer. This is the initial question. Why the Tathāgata asked Subhūti in reverse is because he wished to clarify that buddhas and bodhisattvas have already realized suchness; within the dharma of suchness, how could there be grasping or speaking?