I find the islam idea that the devil (Iblis) is made of the same "stuff" as the human ego absolutely fascinating. In a way, this makes the human ego, and the associated sins of pride and arrogance, a reflection or representation of the devil.
Philosophically speaking, that's a very intriguing concept.
(I'm probably getting details wrong here and I don't know how widespread this idea is among muslims, so please don't make any assumptions based on this. It just makes me frustrated that my education didn't include more exploration of faiths other than Christianity. I'm absolutely not religious, but that doesn't mean there aren't lessons to be learned from and interesting philosophies to be found in various holy scriptures.)
@thomholwerda not trying to be the ‘well akshualy’ guy, but as a Sunni Muslim, I’ve never come across the notion that Iblis is made of the same “stuff” as the human ego.
The mainstream belief is that Iblis was a Jinn (made of fire), and humans are made of clay.
Iblis’ downfall was because he refused to prostrate before Adam because he thought he was superior due to being made of fire. So his ego/arrogance is what is seen as one of the worst traits that a human can have.