This essay examines Ephesians in light of current research in ethnic studies. The methodological advance of such an approach is twofold: first, it moves the exegesis of the domestic codes to the wider frame of the letter; and, second, it goes beyond the limited hermeneutical framework of the ‘origins’ of the reconciliation language to the more productive examination of its function in the text. The concept of ‘one new humanity’ provides evidence for the author's ethnic reasoning, which participated in ancient cultural affirmations of the essential fluidity and changeability of all ethnicity. The author of Ephesians domesticates the mythical language of baptism by making it fit the conventional morality of a household economy, thus presenting the letter's most important ecclesiological concept, that of ‘the body of Christ’, as a unity that is more moral than mythic.