大般涅槃經義記 4.66

4.66

初中，「二人共為親」者，喻凡、菩薩機感相順，故名親友。「一是王子、一是貧賤」辨前二人。王子菩薩從佛王法之所化生故名王子；貧賤喻凡，貧無善財。「互相往反」顯前親友，物機順聖說之為往，聖起稱反。貧凡之人從聖聞我，名「見王子有一好刀」。真我無垢說之為「淨」，真我離相故復稱「妙」，理中精上故名「第一」，聞說愛樂名「心貪著」。

In the first part: 'two people were close friends with each other' is an analogy for the spiritual capacity of the ordinary person and the bodhisattva according with each other, hence called 'close friends'. 'One was a prince, one was poor and base' distinguishes the two persons. The prince is the bodhisattva, who is born through transformation from the Buddha's kingly Dharma, hence called 'prince'; 'poor and base' is an analogy for the ordinary person, who is poor and lacks good wealth. 'Frequently visited back and forth' reveals their prior close friendship: the spiritual capacity of beings according with the sage is spoken of as 'going', and the sage responding is called 'returning'. The poor ordinary person hearing of the self from the sage is called 'seeing that the prince had a fine sword'. The true self is without defilement, so it is said to be 'pure'; the true self is free from marks, so it is also called 'wondrous'; being the finest and supreme within the principle, it is called 'foremost'; hearing it taught and having affection and delight for it is called 'his heart became covetous and attached'.