 This is not the only way of reading the Ethics, however. For surely we cannot expect Aristotle to show what it is about the traditional virtues that makes them so worthwhile until he has fully discussed the nature of those virtues. He himself warns us that his initial statement of what happiness is should be treated as a rough outline whose details are to be filled in later (1098a20–22). His intention in Book I of the Ethics is to indicate in a general way why the virtues are important; why particular virtues—courage, justice, and the like—are components of happiness is something we should be able to better understand only at a later point.