A Most Unlikely Confession

Only one human being calls Jesus "God's Son" in Mark's Gospel.  Only one human being comes to that revelation on his own without any audible help from heaven.  One person sees what Jesus's own disciples have been unable to see.  At the end, on the mount of Calvary, as Jesus is dying in agony and breathing his last, there is a voice, says Mark, but it is not a voice from heaven.  It is the voice of a Roman centurion who says, "Truly this is God's Son."