Abstract

Why is it that forgetting moral knowledge, unlike other paradigmatic examples of knowledge, seems so deeply absurd? Previous authors have given accounts whereby moral forgetting in itself either is uniformly absurd and impossible (Gilbert Ryle, Adam Bugeja) or is possible and only the speech act is absurd (Sarah McGrath). Considering findings in moral psychology and the experimental philosophy of personal identity, I argue that the knowledge of some moral truths—especially those that are emotional, widely held, subjectively important, and contribute to social relationships—cannot be forgotten because they’re too tightly tied to one’s true self. Moral knowledge at the level of individual propositions, when it does not have these attributes and so is not so tied to the agent’s identity, can sometimes be forgotten. I identify two such cases: (1) where the moral knowledge results partly from an emotional trigger that has been forgotten, and (2) where the moral knowledge results partly from a process of reflection that has been forgotten.