Natural philosophers seem to have good reasons to prefer that the kallipolis, the maximally just community of the Republic, is never realized. If such a community is realized, philosophers are under the obligation of a just demand that they govern. However, a life that contains governance as a significant part is not the happiest life a philosopher can live. The happiest life for a philosopher is one consisting entirely or largely in philosophical contemplation. I confront this puzzle by arguing that (...) natural philosophers gain benefits in the kallipolis that are not available to them in other communities, primarily opportunities for correction and punishment. While other communities may offer philosophers more opportunities for philosophical contemplation, these communities do not provide a reliable mechanism for counteracting potentially dangerous moral blindness. In contrast to other communities, the kallipolis institutionalizes and reliably replicates the structures necessary for counteracting moral blindness. (shrink)