The Demonology Series is a book that complements what pastor Ki-Dong Kim preached to teach the spiritual world in-depth that the saints must know as pastor Kim has done his ministry for more than half a century. Many Christians do not know about the spiritual world, and according to that, they do not know the truth and have a religious life ideologically. For this, the writer wrote the book hoping that all Christians will have a life of spiritual victory through the knowledge of the truth, it is not using the great spiritual power that God Father gave us through Jesus from the cradle to the grave.
The reason why the writer wrote the Demonology in three volumes is the operation of the Devil, deceiving spirits, and demons are all different from one another; their identities are different. God created all creation in the world, and all creation lives as God’s will. However, one of the angels rebelled against God and fell from Heaven to Hades; finally, it became the spirit that holds the authority of the air. The Devil continually causes a division between God and man. The deceiving spirits are the angels that were sent to help the saints, but they were turned. The demons are the spirits of dead unbelievers that is the spirit that causes the curses and sufferings that we all experience.
God Father sent Jesus to destroy the Devil, and then through Jesus, anyone can win over the Devil. Therefore, knowing the Devil is the authority for those who received salvation and has the power to have a victorious spiritual life that Jesus commanded.