The doctrine of jihad—violence in the path of Allah with the objective of converting, killing, or else subjugating and taxing the “infidel”—was Muhammad’s most significant original contribution to world history and to the history of ideas, as I have argued elsewhere at some length. It defined Islam in its earliest days, it has defined the relations between “the world of faith” and “the world of war” ever since, and—as we’ve seen from the reactions to Pope Benedict’s lecture—it continues to define the mindset of Islam to this day. ~Srdja Trifkovic