Full version of the prayer: Τὰ καλὰ καὶ συμφέροντα ταῖς ψυχαῖς ἡμῶν καὶ εἰρήνην τῷ κόσμῳ παρά τοῦ Κυρίου αἰτησώμεθα (From the Lord let us ask what is good and profitable for our souls, and for peace for the world)
The phrase τὰ καλὰ καὶ συμφέροντα ("what is good and profitable") is extremely ancient, going back at least to Demosthenes: cf. his
On the Navy (Περὶ τῶν συμμοριῶν) 28.7.