 This does not mean that Machiavelli's confidence in the capacity of republican government to redress the political shortcomings of human character was unbridled. After all, he gives us no real indication of how republics manage to identify and authorize the leaders whose qualities are suited to the circumstances. It is one thing to observe that such variability has occurred within republics, quite another to demonstrate that this is a necessary or essential feature of the republican system. At best, then, Machiavelli offers us a kind of empirical generalization, the theoretical foundations of which he leaves unexplored. And the Discourses points out that republics have their own intrinsic limitation in regard to the flexibility of response needed to conquer fortune. For just as with individual human beings, it is difficult (if not impossible) to change their personal characteristics, so 