Aristotle believed that virtue, or excellence of character (arete), was the key to human happiness (eudaemonia). He identified two types of virtue - intellectual virtues related to our professions, and moral virtues common to all humans. Moral virtue is developed through habituation starting in childhood. The virtuous mean between two extremes is the balanced, correct course of action. Achieving moral virtue through consistently choosing the mean requires good character, which in turn requires good habits developed over a lifetime.