We look at angels in the Bible, who they are and what purpose they serve - and at the non-biblical notion of a "guardian angel".  What is the basis for this widespread belief, that we each have an angel watching over us, guiding and protecting us as we move through life on Earth?  Just as an angel came to strengthen Jesus on the Mount of Olives as he was accepting the horror that was going to befall him, we, too can turn to this host of Heavenly beings.