Practical Nous in the Nicomachean Ethics

The paper presses an analogy between Aristotle’s conception of practical reasoning and theoretical reasoning. It argues that theoretical reasoning has two optimal cognitive states associated with it, episteme and (theoretical) nous, and that practical reasoning has two counterpart states, phronēsis and (practical) nous. Theoretical nous is an expertise which enables those who have it to understand principles as principles, i.e. among other things, to know how to use them to derive other truths in their domain. It is a cognitively demanding state, which only experts have. Aristotelian practical nous is structurally similar to theoretical nous in that it requires the agent not only to know certain everyday truths, but also to know how and when to use them in deliberative reasoning. It is also a cognitively demanding notion, and only moral experts will have it.