Every person has his angle or perspective on reality. Every angle is an angel. Just imagine how many angels there are.
The three lower worlds, Creation, Formation, Action, correspond to intellect, emotion, deed. Each has angels: fiery, living, rolling beings.
An intellectual angle on reality is a fiery angel. An emotional angle on reality is a living being. An active angle on reality is a wheel.
Giving creates a vessel for receiving, the more you give the more you receive. Be compassionate to others, God will be compassionate to you.