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They are rarely visible.

I suppose it's different for everyone, given the ethereal nature of angels.

Maybe there have been many angels in my life which were simply invisible to me. How would I know.

[boatbums]

The angels are spirit beings (perhaps on a whole 'nuther plain than we inhabit). On occasion, they appear in human form, sometimes in a superhuman form. This is an informative site The truth about angelic beings .