In I Peter 5 I want you to see that when we get to the conclusion of the book, it is telling us what to do in difficult situations when it seems hopeless and we're going through great difficulty.
The thought is this: Satan may or may not be the cause of the situation, but even if he is not, he is prowling around to take advantage of it, that he might pick us off. The roaring lion—who does the lion most likely attack? The strays; the ones who are on the fringes; those who are on the outside; those who are not keeping up with the group.
When we think of that spiritually, they are simply people who are not with it. They are wearying under the barrage of problems that causes them to begin to separate themselves away. Then Satan, the roaring lion, picks off the strays.
He is especially adept at taking advantage of people's feelings. All too often we are dominated by our emotions rather than facts or, we might say, the truth of God. Under that kind of a circumstance, it is very easy for us to get our feelings hurt, ignore the facts, and proceed to lie to ourselves just like Satan did at the beginning of the process.