'Son of Man' is practically the only self-designation employed by Jesus himself in the gospels, but is used in such a way that no hint is left of any particular theological significance. Still, during the first many centuries of the church, the expression as it was reused was given content, first literally as signifying Christ's human nature. Later 'Son of Man' was thought to be a christological title in its own right. Today, many scholars are inclined to think that, in an original Aramaic of an historical Jesus, it was little more than a rhetorical circumlocution, referring to the one...