Plato says that happiness is the possession, or the possession and correct use, of goods. Correlatively, misery is the possession of bads, or the possession and incorrect use of goods. If we ask why anyone does what she does, and reach the point of showing how her action fits into a happy life, we have fully explained and justified her action; no further question about why she wants to be happy and live well is apt. Put another way, we do everything for the sake of happiness, and we need nothing beyond happiness. Wisdom is both our highest good and the ability to use other goods well and beneficially. So, wisdom should be the first concern of anyone who wants to live well and be happy—that is, everyone. In particular, wisdom is more important than bodily and reputational goods such as health and honors. But as the condition that enables skillful activity in any domain is expertise in that domain, so too the state that enables skillful activity with goods is expertise concerning goods. So, wisdom—the highest human good—is knowledge of the good.