Johnny Cash sings this with such pain! Perfect pairing of song and video.
http://www.youtube.com/watch?v=bhM4Kd5Ov38
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It was worth a wound–it was worth many wounds–to know the depth of loyalty and love which lay behind that cold mask. The clear, hard eyes were dimmed for a moment, and the firm lips were shaking. For the one and only time I caught a glimpse of a great heart as well as of a great brain. All my years of humble but single-minded service culminated in that moment of revelation.