 Aristotle distinguishes two kinds of virtue (1103a1–10): those that pertain to the part of the soul that engages in reasoning (virtues of mind or intellect), and those that pertain to the part of the soul that cannot itself reason but is nonetheless capable of following reason (ethical virtues, virtues of character). Intellectual virtues are in turn divided into two sorts: those that pertain to theoretical reasoning, and those that pertain to practical thinking (1139a3–8). He organizes his material by first studying ethical virtue in general, then moving to a discussion of particular ethical virtues (temperance, courage, and so on), and finally completing his survey by considering the intellectual virtues (practical wisdom, theoretical wisdom, etc.).