One striking feature of apocalyptic readings of Paul—and the Protestant dogmatics that follows after such a Paulinism—is the ‘widescreen’ portrayal of Sin as Power. This account stresses the ‘three-agent drama’ of salvation and the bondage of human persons to anti-God forces. It resists moralising interpretations of human sins in favour of a starker moral cosmology. In this way, it seems to leave ‘ethics’ and ‘freedom’ in suspension. Contrast the approach of the moral theologian Oliver O’Donovan. Here, sin is a case study in the difference of perspectives between dogmatics and ethics. Dogmatics, ‘making sin exceedingly sinful, quickly resorts to apocalyptic largeness of scale’. Ethics is concerned instead with ‘possible’ sins. It describes sin in phenomenological rather than ultimate terms—something to be avoided in the next moment of free agency. This article distils the theological commitments each intends to secure, observes what each risks, and seeks to determine what is at stake. It draws them together in a synthetic moral ontology, but also looks further, to an integrative account that can inform moral discernment. To this end, the final section observes how subsequent work in Pauline studies converges with discussions about structural sin in Catholic social thought.