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In a world filled with real and fancied demons for the young, the form their faith takes may be less important than the fact that they have it. Ronald Knox, who set out in Enthusiasm to expose the heresies of religious enthusiasts, concluded by praising their spirit. "How nearly we thought we could do without St. Francis, without St. Ignatius," he ended his work. "Men will not live without vision; that moral we would do well to carry away with us from contemplating, in so many strange forms, the record of the visionaries." Enthusiasm may not be the only virtue but, God knows, apathy is none at all.