 There are Stoic philosophers like Marcus Aurelius, Cicero, and Seneca, and then Enlightenment philosophers like John Locke and Francis Hutchison and David Hume. And when I read those books, I was struck first that all of them contain the phrase, the pursuit of happiness, and they define happiness not as feeling good, but as being good. Not the pursuit of immediate pleasure, but the pursuit of long-term value.