仁王護國般若波羅蜜多經疏 2.114

2.114

解曰：前明般若，果德已彰。此問如來，即相觀性。又彼時眾雖聞勝空，未解亡相，故佛興問令正觀矣。爾時等者，文如前解。汝以何相者，以有為相、以無為相而觀如來？從此第二波斯匿王答。於中分三：一直明實相、二約法別明、三結觀如來。且初第一直明實相。

The commentary explains: Previously, prajñā was clarified, and the resultant virtues were already made manifest. Here, asking about the Tathāgata means contemplating the nature right through the characteristics. Furthermore, although the assembly at that time had heard of supreme emptiness, they had not yet understood forgetting characteristics; hence the Buddha raised the question to cause them to contemplate correctly. 'At that time...', the text is as explained before. 'By what characteristics?': do you contemplate the Tathāgata by conditioned characteristics, or by unconditioned characteristics? Next is the second part, King Prasenajit's reply. It is divided into three parts: first, directly clarifying the true mark; second, explaining specifically in terms of dharmas; third, concluding the contemplation of the Tathāgata. First is directly clarifying the true mark.