大般涅槃經集解 44.52

44.52

案僧亮曰：方便誘引，不即法實。以業為譬，下是其正體。如來菩薩以譬嬰兒者，義似嬰兒，廣其非行體也。何者？解脫中云：如來有嬰兒行，無有是處。此之證也。亦可佛菩薩是嬰兒行本，名嬰兒行也。僧宗曰：第二譬也。

Sengliang comments: Enticing through upāya, it is not immediate to the reality of phenomena. Using karma as an analogy, what follows is its authentic substance. That the Tathāgata and bodhisattvas are analogized to babies is because in meaning they resemble babies, broadly explaining that it is not the substance of the practice. Why? In Vimokṣa it says: 'That the Tathāgata has baby practice is impossible.' This is proof of it. Alternatively, it is that Buddhas and bodhisattvas are the root of baby practice, hence it is called baby practice. Sengzong says: The second analogy.