There is a war in progress between God and His forces on one side, and the devil and his forces on the other side. Whether you like it or not, you are a part of that war. If you have received the Lord Jesus as your Lord and Saviour, God has enroled you in His army and expects you to fight for Him and with Him. If you have not yet received the Lord Jesus as your Lord and Saviour, then you are on the devil's side, fully registered in his army, even if you have good intentions.
If you do not yet belong to the Lord Jesus, then the devil wants to ensure that you never leave his army. If you already belong to the Lord Jesus, then the devil aims at :

making you as ineffective as possible. using you as a spy to betray the Lord Jesus.

You cannot be neutral. By your every thought, word and deed, you are helping to advance one of the two sides in the conflict. With your every second, minute, hour and day, you are either working with God for the advancement of His army and Kingdom or helping the devil, His rival, to build his army and kingdom. You do well to choose rightly.
The Lord Jesus won the great victory over the devil and his host on the cross. We consider it a great privilege to proclaim that victory. We are compelled by the very nature of the truth to present Jesus as the Saviour, Teacher, Deliverer, Healer and Victor, even though we have only experienced Him as our Healer to a limited degree. The great extent to which we have seen Him work as the Deliverer gives us hope that we shall soon see Him move in a limitless way as the Healer. I have consulted the books: "Love not the World" by Watchman Nee and "War on the Saints" by Jessie Penn-Lewis as I wrote these messages. In addition, my experience of walking with Christ for 18 years has undoubtedly provided the ground work for this book. As companion volumes to this book, we have also written: "Deliverance from Demons" and "The Overthrow of Principalities." It will be necessary to read these two books to have a complete picture of spiritual warfare as we see it.

Spécifications