Hi @jadams2k18!
It is found in the book of Enoch. It's an ancient manuscript that has all the revelation about the spirits (fallen angels) and the origin of there rebellion and their fall.
We are living in the flesh, but there are still lots of unseen forces invisible for human eyes but things beyond human comprehension but actually exist and generally affects the humans existence and daily living - the spirit realm.
For what can be seen by the human eyes are only temporary but those unseen are eternal.
Well that's my own point of view according to all knowledge I've gained in my personal readings.
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