Harvey Mansfield reflects on The Federalist and why it should be read seriously as a great work on politics. Mansfield’s discussion calls our attention to the subtlety and complexity of the argument of The Federalist, as a whole, and explains why it remains an indispensable guide for thinking about American government. Mansfield and Kristol also consider how The Federalist draws on, but also differs from, works of ancient and early modern political science in its analysis of good government and republicanism.