There is a famous sentence in Thomas Jefferson’s declaration of independence that formulates something essential about what most modern liberals believe about both government and education: “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of happiness.” Some of us might not believe in the creator part, and all of us would assume now that by men Jefferson means men and women, but probably none of us would quibble with the idea that people are born, if not created, equal, and that they have a right to life and liberty. But what does it mean to have an unalienable right to the pursuit of happiness? At first sight, it seems to be a pretty good idea; no one, presumably, wants to promote the pursuit of unhappiness.