大般涅槃經義記 6.151

6.151

「見佛性者」自欲求證，欲為此事當先淨身。二以淨身，無人譏呵。三無人呵故，敬信發心。如來結歎「則是眾生善知識」等，「是名」已下結異世間。

'One who sees the buddha-nature' himself seeks to realize it; intending to undertake this matter, one must first purify one's body. Second, because the body is purified, no one will ridicule or scold. Third, because no one scolds, they will revere, have faith, and arouse the [bodhi] mind. The Tathāgata concludes with praise: 'is then a good spiritual friend to sentient beings', etc.; from 'this is called' downward, it concludes how this is distinct from the worldly.