Put on the full armor of God so that you can take your stand against the devil's schemes. Most of us in Western cultures grew up with a scientific, materialist mindset. If you cannot see it or touch it or measure it in a scientific manner, than it is not real. But there are some things which science is not equipped to measure. Love, for one, right and wrong, for another.
Spiritual beings are the same way.
Interesting, since Jesus had a great deal to say about both. In case we didn't know, Paul instructs us on the nature of our spiritual struggle in vss. It can be used of good rulers as well as bad. Peter Wagner and others in the contemporary intercessory prayer movement in the US believe that spiritual rulers seek to control and influence neighborhoods, cities, regions, and countries. Wagner reports local spiritual breakthroughs in response to prayer directed against the ruling spirits of an area.