"I have a broad definition... Liberalism is a doctrine that was developed in the middle of the 17th century, at the end of Europe's wars of religion, in which a number of early liberal thinkers... said we need to lower the aspirations of politics, not to seek after "the good life" as defined by a particular religious doctrine, but simply to protect life itself by cultivating a virtue of tolerance, whereby, at that time Protestants and Catholics, but... today maybe and could live together peacefully, allowing each to individually choose... what to believe, what to speak, and the like. It believes that all human beings are endowed with a certain basic level of dignity that is equal among all those human beings, and it is institutionalized through a rule of law, by constitutional provisions that prevent the excessive power of the state to limit individual choice. It's not necessarily associated with a particular economic ideology, except that it does protect private property rights... [S]o you can have an expansive social democratic government, like in Sweden or Denmark, or you can have a more limited one like in the United States... [T]hose are all... liberal societies because of that commitment to rule of law."