Viewed in the light of liberal commitments, Calvin’s chief error appears to be his presumption that the civil magistrate has not only the right, but the duty, to use his coercive office to enforce “piety.” As Calvin argues, the political ruler must recognize his duty “to cherish and protect the outward worship of God, to defend sound doctrine of piety and the position of the church” and to “form our social behavior to civil righteousness,” thus promoting social peace (Institutes 4.20.2). To liberals, of course, this appears dangerously intrusive.