This is just a THEORY, so please don't jump at me if you don't like it or you find it somehow unflattering. :9
So, I've been thinking (dangerous thing for a blond, I know) people have been taking demons/angels too much like their friends or enemies. But what if they are just fragments of our minds, personalities and consciousness (in other words our whole beings).
Then summoning 'demons/angels' would be raising different energies for different spells or other magickal doings.
Also, it means that people seriously mistook what Bible and Goetia are about (taking these two examples 'cause they're most popular).
If my 'theory' is correct Bible would be telling about how we should build our personalities and it would be directing our minds to morality, not telling about actual entities who lurk about and wait to mislead us or help us. Meaning that Christianity has been hovering to fluffyness for the past ____ years, and resulted in todays ignorance.
Now, I don't know too much about Goetia, so I'm not gonna get into it too much. But I believe that, Solomon, too, has been writing about brain/mind fragments.
We all know about balance, it's everywhere in the universe, including us. This is a bad comparing, but you know in cartoons when the individual is making important decisions and the little guys appear on both of his shoulder (demon and angel guides?), that would be light and dark/good and bad in us (and the balance calls for consciousness). So, metaphorically speaking, we all have a demon and an angel in us, it's just which one of them is more dominant on different decisions, that makes our personalities unique and different than others. This theory would also fly with Yin-Young.
And the demons/angels (as entities) that people are talking about would be just the same higher beings than us.
Thanks to SaidGuidenc and 0IY0KPA_TAKA for encouraging me to write this thread.
Everyone, please share your opinions on this theory. =]