Lucifer was once the most beautiful angel in all of existence. God loved him best of all his brothers, even more than Michael. Lucifer was proud.
When humanity was created, he was unwilling to accept its place in God’s favor. And when God commanded all of Heaven to love his new children more than himself, Lucifer refused. Lucifer pleaded: “Father, I can’t. These humans are flawed. Murderous!”
After persistent disobedience, Lucifer was cast out of Heaven.