Abstract

Both Kant and Sidgwick recognize a deep tension between moral and prudential reasons. On the basis of what we can observe, both agree that fulfilling one’s moral obligation is not always prudentially optimal. And, both agree, if acting morally must sometimes come at the cost of one’s own happiness, then we should be skeptical about the possibility of having a completely rationalized — that is, a completely systematic and coherent — account of practical reason. Both suggest that, the empirical world being thus, the only way that practical reason can be rendered coherent is if we assume the existence of God, as the being who will ensure that acting morally is always conducive to one’s happiness, through a system of divine rewards and punishments. Ancient eudaimonism might seem to offer a solution to the dualism of practical reason, and without any theological assumptions. Eudaimonism holds that there is indeed a single ultimate rational aim that can accommodate all of our ethical concerns, namely, the pursuit of an agent’s own happiness. Kant and Sidgwick, however, are pessimistic about the possibility of eudaimonist theories successfully reconciling both ethical and moral concerns under a single system of practical reason. In this paper, I review the challenges that Kant and Sidgwick pose to eudaimonism, and argue that there are resources within ancient theories — and with Aristotle in particular — to potentially resolve at least some of their concerns. Much turns on how exactly we understand ancient eudaimonist theories, and I argue here that this question is far from settled.