Satan's power is over all the nations of the earth. That could be very frightening when we realize he can influence men in such a way that they are not even aware that they are being influenced toward evil. His power is so extensive that he is over all the nations of the earth. Jesus calls him the ruler of this world (John 14:30). He affects people's attitudes by moving our reasoning processes toward satisfaction of the self. He gives disinformation and stirs up our spirit.
Here is what is so perverse about this: It is not evil for one to take care of himself. What is evil is to make the satisfaction of the self more important than God or others. We are to serve God before all else (the great commandment), and the second is like it—we are on an equal par with others physically. Nowhere are we given the right or privilege by God to make ourselves greater than or more important than God or other human beings.
We can imagine the direction Satan is going to move us toward—to the point that satisfaction of the self becomes more important than conforming to what God says is the limit of our authority. In other words, he will push us toward making ourselves greater or more important than righteousness or truth.