Too many Christians give the devil more credit than he deserves.  This book clearly shows that he is the defeated foe and you, the church, can walk in dominion over him.  If you are born again, you have all authority and power, dominion and might over the weapons and strategies of this humiliated enemy. 

Before Calvary, Satan was able to overcome through the abilities and armor he had.  Since Calvary, HE is the one who is overcome.