From Mark Lilla’s The Shipwrecked Mind: “Successful ideologies follow a certain trajectory. They are first developed in narrow sects whose adherents share obsessions and principles, and see themselves as voices in the wilderness. To have any political effect, though, these groups must learn to work together. That’s difficult for obsessive, principled people, which is why at the political fringes one always finds little factions squabbling futilely with each other. But for an ideology to really reshape politics it must cease being a set of principles and become instead a vaguer general outlook that new information and events only strengthen. You really know when an ideology has matured when every event, present and past, is taken as confirmation of it.”