The puzzle is this: I argue that for Reid, moral sense needs benevolent affections – i.e. some of our animal, non-cognitive principles of action – to apply the rules of duty. But he also thinks that duty can conflict with benevolent affections. So what happens in these conflict cases? I will argue that Reid takes moral psychology seriously and that he believes that our natural benevolent affections can be used as indicators of duty. Although creative, his account has a major (...) problem, because he does not resolve certain conflicts that arise between what action a duty prescribes and what action a natural affection, associated to that duty, inclines us to do. (shrink)