I think there is no difference between the evil and angel , it is decided just in a second, the thought in the second!

There is two personifications : Devil personifies the badness and the Angel personifies the goodness; we can’t say there is a difference between human being and these two, because we are made from light and darkness so, as Choutte said they there are in our inner.

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From my point of view, I'd explain it like this: good and evil, angel and devil are both two different opposite complementary equipotent aspects of human inner nature.

hello! sure for me ,good and evil are two parts of human nature! but for angels ther's devil's angels and god's angels ! but ther's sure no human angel!