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Of all the terms used in the world's religions, none is as controversial as jihad. Jihad literally means "struggle," and Muslims have traditionally understood it to point to two kinds of struggles: the spiritual struggle against pride and self-sufficiency; and the physical struggle against the "house of war," namely, the enemies of Islam. The second of these struggles calls for a variety of tactics, including preaching, teaching, and working for social justice. It may also include war.
Some apologists for Islam have tried to minimize the importance of jihad, and to insulate Islam from its extremists, by arguing that, of these two struggles, the spiritual struggle is higher. A Muslim merchant I met in Jerusalem took this argument further, contending that jihad has nothing whatsoever to do with war because jihad is nothing more than the personal struggle to be good. "Treating me with respect is jihad," he said. "Not ripping me off is jihad." The Quran, he added, never even mentions war.
But the Quran does mention war, and it does so repeatedly. One Quranic passage commands Muslims to "fight," "slay," and "expel" in the course of just two sentences (2:190–191), while another says that fighting is "prescribed . . . though it be hateful to you" (2:216). Whether it is better for a religion to largely ignore war (as the Christian New Testament does) or to carefully regulate war (as does the Quran) is an open question, but there is no debating the importance of the themes of fighting and killing in both the Quran and Islamic law. So while it is incorrect to translate jihad as "holy war," the plain sense of this struggle in both the Quran and contemporary Islamic practice is both spiritual and military.
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Stephen Prothero (God Is Not One: The Eight Rival Religions That Run the World--and Why Their Differences Matter)