 One question that late thirteenth-century authors discussed was related to the unity of the virtues. It was prompted by Augustine’s critique of the Stoic position as well as by Cicero’s De officiis (Kent 1984, pp. 523–25), and it received a new impetus with Aristotle’s argument that a virtuous person necessarily has all virtues of character because prudence is necessary for each genuine virtue, and prudence in turn entails all other virtues (EN 6.12–13). The idea is roughly that a prudent person can grasp what is the best course of action all things considered, and this requires finding a correct balance that meets the requirements of all virtues: one who acts bravely must also act justly because unjust bravery is not a real virtue.