[Deva:]

He who's an Arahant, his work achieved, Free from taints, in final body clad, That monk still might use such words as "I." Still perchance might say: "They call this mine." ... Would such a monk be prone to vain conceits?

[The Blessed One:]

Bonds are gone for him without conceits, All delusion's chains are cast aside: Truly wise, he's gone beyond such thoughts.[1] That monk still might use such words as "I," Still perchance might say: "They call this mine." Well aware of common worldly speech, He would speak conforming to such use.[2]

Notes

1.: Ya.m mata.m: "whatever is thought." Mrs Rhys Davids's emendation of yamata.m in the text (paraphrased as "conceits and deemings of the errant mind," following the Commentarial maññana.m "imagining").
2.: Cf. DN 9: "These are merely names, expressions, turns of speech, designations in common use in the world, which the Tathaagata uses without misapprehending them."