It was right then that I started thinking about Thomas Jefferson on the Declaration of Indepence, and the part about our right to Life, Liberty, and the Pursuit of Happiness. And I remember thinking how did he know to put the Pursuit part in there? That maybe happiness is something we can only pursue and maybe we can never really have it. No matter what. How did he know that?
— Chris Gardner, "The Pursuit of Happyness"