Since SATAN was an angel in heaven enjoying eternal life and bliss, so what made him betray god? does Lucifer has a form or formless as an angel, same question now that he is SATAN, who is said to be responsible for all evils in this world.
but then the question arise is, where does the evil when he was an angel before betraying god? where does the evil thought resided? the truth is that everyone of us is deluded and ignorant, as long as we are not enlightened, ie see things as they truly are. same goes for Lucifer. if there were no evil in heaven, where come the evil thought of betraying god?