 So far from offering a decision procedure, Aristotle insists that this is something that no ethical theory can do. His theory elucidates the nature of virtue, but what must be done on any particular occasion by a virtuous agent depends on the circumstances, and these vary so much from one occasion to another that there is no possibility of stating a series of rules, however complicated, that collectively solve every practical problem. This feature of ethical theory is not unique; Aristotle thinks it applies to many crafts, such as medicine and navigation (1104a7–10). He says that the virtuous person “sees the truth in each case, being as it were a standard and measure of them” (1113a32–3); but this appeal to the good person’s vision should not be taken to mean that he has an inarticulate and incommunicable insight into the truth. Aristotle thinks of the good person as someone who is good at deliberation, and he describes deliberation as a process of rational inquiry. The intermediate point that the good person tries to find is