'Don't forget to entertain strangers, for by so doing some people have entertained angels without knowing it.' It's from the Bible. Maybe your friend… - Angel Song

I'm sure that if he really does see angels, they are sent to him for a specific purpose that is beyond our understanding. And if someone else—say, you, for example—were to see or hear angels, it might be for an altogether different purpose.

Keith seems to be able to see and hear angels from time to time.

If only everyone could see, they would realize that the one they thought weak, was actually the strongest one among them.