My summary says it all - Johnny Cash was never in 'better voice' than when he recorded this song - that includes his 50's and 60's songs.  He has more range and smoothness in this song than any other - perhaps it's the message that he's trying to send to all believers, and his convictions are well made in the lyrics of this song; quite spooky when you listen to what he has to say, as it applies in the current age as much as it did in 1990, 2001, and now.  I put this song right up there second only to "Ring of Fire".  This is Johnny Cash at his best.