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From LSJ

οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well

Source

Greek (Liddell-Scott)

ἀντευποιῶ: ἀντευεργετῶ, Ἀριστ. ἔνθ’ ἀν.