We should not be frightened or terrified. The passage suggests to us that this war is a fight to the finish. Because he commands us to live this way, Paul is implying that it is possible to fail, that we can turn tail and run. But the other possibility is raised here also. If we are the kind of people we ought to be, then those in the world who oppose the Lord will be faced with their own destruction.
Insecurity is the modern psychological term for fear.
The areas in which you feel most insecure, most vulnerable, are those you ought to look to for spiritual attack. Recognize those as the areas where you will have difficulty standing firm and living as you ought to live. It would be easy for us to picture this battle if it were fought in the way the military took over in Poland recently, for instance. If Communist soldiers marched down our streets and put a knife to our neck it would be quite clear who our enemy is and where we should stand. Two areas occur to me.