The reasons why Lucifer fell to heaven and rebelled are as follows:

1. Pride; the archangel who rules over other angels, Lucifer, the powerful and favored angel of God, has no regard for himself He was overconfident in his power and thought he could replace God on the throne of heaven, so he led other angels to rebel. But he was defeated and fell from heaven.

2. Jealousy; there is a saying that the reason why fallen angels such as Lucifer rebelled against God was jealousy rather than pride. God first created angels, and then created humans from clods of clay. However, God favors humans more than angels and places humans in a higher position than angels. Lucifer and some angels were dissatisfied that humans with low abilities were favored more. There is also a monologue in "Paradise Lost" where Lucifer explained that the reason for his betrayal of God was jealousy of humans rather than pride.

3. Disobedience: When God created humans, angels were told to obey this new creation. However, angels born of fire cannot obey humans born of clay and resist. Also, Lucifer, who was once the Seraph Archangel and was much loved, was told when God first created angels that he could only respect God, be loyal to God, and not obey anyone other than God. So when God forgot this command and asked him to obey humans, Lucifer refused and was therefore banished from heaven. Lucifer, who was exiled to hell, naturally hates humans.

4. Lust; the elves and angels were originally responsible for supervising human beings, but they were seduced by the charm of the beautiful daughters of Adam on the earth. They ignored God's taboos and descended to the earth to associate with the daughters of Adam. They also taught humans the same forbidden secrets of heaven, such as metal processing techniques, makeup methods, astronomy, etc., thus incurring the wrath of the gods.

5. Free will; God also created a group of angels who are different from ordinary angels and have free will. These angels with free will are equal to God and are free beings. They avoid the fact that there is only one God and turn away from God. Some do not leave the heavenly world, and some descend into the atmosphere of lower classes. Angels who landed on the ground became humans, and those who landed further became demons. Greek theologians argued that just as angels could become humans, humans could become angels, and even demons could transform back into angels.