when Paul calls upon us to stand, he is not saying that there's a lack of forward momentum in the Christian's life. He merely is saying by the word “stand” that there is no retreat. He doesn’t mean we don't move forward, but we don't move backward. Stand and moving forward are not incompatibles. As a matter of fact, in verses 11 and 12, it's not apparent in your English translation, but Paul uses the same preposition seven times, and it’s the Greek preposition “pros” πρός, which basically has the meaning of facing forward, forward, forward, forward, forward, facing forward. So, the idea is not that we don't move forward, or face forward, but that we never turn our backs and retreat. In other words, Paul says, with all seriousness, this walk that we've been talking about is a war, and this is militant, or military, language, “putting on the whole armor of God, breastplate, shield, helmet, sword. Having done all of this, to stand in the evil day.”
Charles Hodge says it this way: “It is something real and arduous, difficult and dangerous. It is one in which many are wounded, and often succumb. It is one in which great mistakes are often committed, and serious loss incurred, from ignorance of its nature (that is, of the warfare), and the appropriate means for carrying it on.”
So, this walk is not just a stroll down the avenue. It's a war, and we’re called upon to “put on armor, and to be strong in the Lord, and in the strength of his might.”
Now, there are two things that we assume to be true, because we know them to be true, and two things that we are told here again by implication or graphically, and those two facts are these:
#1: “I am weak,” and each of us needs to say that for ourselves. “I am weak,” and that's why Paul says “be strong in the Lord.” Why would he call upon us to be strong in the Lord unless we were weak without the Lord? The first thing I know intuitively, and the text suggests, is that I am weak.
The second thing generally that the text tells us, and is the second fact, is that my enemies are strong. Now, those two things complicate each other, don't they? On the one hand, I am weak, and on the other hand, my enemies are strong. Now that paints a picture that, if that's the case, something needs to be done, and that's what Paul is all about at this point: I am weak; my enemies are strong. Now, the fact that I am weak, and that I recognize that I am weak, we need to realize that in the New Testament meekness is a virtue. What does our Lord say in the sermon on the mount? “Blessed are the meek,” but weakness is not. You may admit that you’re weak. You may in fact be weak, but you can't celebrate that fact. Meekness is a virtue, but weakness is not. We may honestly say we’re weak, but we cannot honorably say we’re weak. Do you see the difference? In fact, Lenski says “Christians dare never be weaklings.” What does Paul say? “Be strong.” Well, if being weak was a virtue, he might've said “Be weak,” but he doesn’t, does he? He says “No, don't be weak; be strong,” and so we have these two things: I am weak. Therefore, he begins by calling upon us to be strong. My enemies are strong; therefore he enumerates who they are, and tells us to put on armor in order to stand against them.