Aristotle (c. 384-322 BCE)
“Wisdom produces happiness, not as medical science produces health, but as health does. For wisdom is a part of virtue as a whole, and makes a person happy by his possession and exercise of it.”
- From The Nicomachean Ethics (Book VI, section xii, Bekker page 1144a) by Aristotle, translated by J. A. K. Thomson (Penguin Classics, 2004).