Migratory birds fly very high, for three reasons. First, at a high altitude they can see better where they are going. Secondly, they are above the predatory birds that may prey on them. Thirdly, in that rarefied atmosphere they can fly very swiftly and easily. That is a parable of the way of prayer. Our souls are migratory souls. Our home is not here, but with God, to whom we seek to rise on the wings of prayer. We want to get high to see where we are going ... to rise above the noises, the fuss, and all the complications that distract and rob our lives of their own spiritual quality ... to pass swiftly to our true home, the communion of our souls with God.
Angels are forms, images and expressions through which the essences and energy forces of God can be transmitted; and, since there are an infinite number of these forms, the greatest service anyone can pay the angelic host is never consciously to limit the ways angels might appear to us.