" Christianity and Islam are sister religions, and in Iberia they long lived side by side. If you are about to hunt your sister out of your home, you need to work yourselves into a much more self-righteous frenzy than if you were expelling a stranger. "

― Nigel Cliff , Holy War: How Vasco da Gama's Epic Voyages Turned the Tide in a Centuries-Old Clash of Civilizations