http://www.straightdope.com/columns/read/2059/whats-the-deal-with-angels

An interesting secular analysis of a nonordinary topic.

“The Jewish philosopher Philo (20 BC-50 AD) wrote that God manifests Himself to people as an angel. Not that God changes, but that people perceive God in different forms, and those are the angels. Thus, Michael is the burning bush, and Metatron is the staff of Moses, etc.”