Many say, I don't have anything to deal with. I don't need to deal with things of this world. That's never going to be true? When we are not dealing with things, then something is wrong. We must be going the wrong direction or something.
It has been estimated that 25%, of the miracles that Jesus performed were casting out demons out of people. Like it or not we have been born in a war zone. When you are born again, you are born into a war zone. You have to realize, just because of the day Adam and Eve fell, we have been born into a war zone to have to deal with spiritual wickedness in high places.
Whether there is a snake still going about, talking about the devil. He is still trying to tempt and just destroy us and sway us off the path that we are supposed to be on. Not only are we all stuck to have to battle with people who have chosen, and here is what Bill means by this, they have chosen by their own free will to live a life on the dark side.