大般涅槃經義記 4.55

4.55

下明菩薩依經見中，「若剎利等斷除，即見成無上道」明諸菩薩斷惑證見，菩薩處世不出四姓，故說剎利、婆羅門等。

Below, in explaining that bodhisattvas see relying on the sūtra, 'if kṣatriyas and others sever and eliminate [defilements], they immediately see and achieve the unsurpassed path' explains that bodhisattvas sever delusions and verify vision; bodhisattvas residing in the world do not go beyond the four castes, and therefore it speaks of kṣatriyas, brāhmaṇas, and so forth.