I believe that angels are forms, images, and expressions through which the essences and energy forces of God can be transmitted and that, 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.
The way one looks at distant things
For you are only one thing among many.
And whoever sees that way heals his heart,
Without knowing it, from various ills.
A bird and a tree say to him: Friend