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.
A disciple suddenly discovered the richness of fecundity of emptiness -- the realization that everything is impermanent, unsatisfactory, and empty of self. In this mood of divine emptiness, he sat in joy under a tree, when suddenly flowers began to fall all around him.
And the angels whispered, "But I haven't uttered a word about emptiness."
"True," the angels replied. "You have not spoken of emptiness, we have not heard of emptiness. This is true emptiness." And the showers of blossoms continued to fall.