Utilitarianism says that we should maximize aggregate well-being, impartially considered. But utilitarians that try to apply this principle will encounter many psychological obstacles, ranging from selfishness to moral biases to limits to epistemic and instrumental rationality. To overcome the most important of these obstacles, utilitarians should cultivate a number of virtues. These virtues are selected based on two criteria. First, the virtues should be impactful: they should greatly increase your impact (according to utilitarian standards) if you acquire them. Second, the virtues should be acquirable: they should be psychologically realistic to acquire. These criteria yield that utilitarians should prioritize six virtues: moderate altrui...