How are we to understand the things that happen to us which disrupt our carefully planned lives? They may be minor interruptions to our day, or major disasters. Either way, they unsettle us and cause us to ask "Why this, and why now?"
Or at least, if we are brought up to believe that we are 'masters of our own destiny' they will unsettle us. Likewise, if we believe that we can discern and obey God's will for our lives day by day, we will find ourselves asking questions. If we are complete fatalists, or if we believe that God is arbitrary and unpredictable in what he does, we may be much less concerned with asking "Why?" It's our fate, or the will of the gods, and we just have to accept it.
Christians tend to adopt one of three responses to unexpected set backs to their plans. The first response is to see the disruption as the work of Satan, and to be even more determined to press on. After all, if Satan is trying to oppose what we are doing, it must be good!
The second response is to assume that God is testing us in some way, to see if we will continue to obey him. Again, pressing on is usually the only appropriate response.
The third response is to wonder whether it's our own fault. Maybe we're heading in the wrong direction. Perhaps our plans are misguided and we need to change our minds. If so, then more prayer and preparation are needed before we move on
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I suspect that which response we adopt is partly a matter of personality. Those who are self confident are more likely to consider the first two options, while the person who is prone to self doubt or cautiousness will tend to think of the third possibility first.
But there are also differences in theology (that is, our understanding of God) in the three responses. The first sees Satan as God's implacable enemy, the source of all evil. This view avoids attributing evil to God, whose goodness cannot look upon evil, far less will it. The weakness in this view is that it attributes far too much power to Satan and even risks falling into a dualism where the 'good guy' is at war with the 'bad guy' and eventually overcomes him. It also ignores those places in scripture where Satan requests permission from God for his actions or even seems to do God's bidding.
So, for instance, when the gospels say that Jesus was led into the wilderness to be tested by Satan, it was clearly the Holy Spirit doing the leading. When Paul says that in order to keep him humble he received a "messenger of Satan in his flesh" it seems unlikely that Satan himself was interested in Paul's humility. The implication is that God wanted Paul to remain humble and allowed (or even called upon?) Satan to inflict him.
If we take the view that God is absolutely sovereign over every event, then all that happens to us must ultimately be from God, and by his will. This is the theology of those who adopt the second response. If we're not to fall into the trap of thinking that bad things only happen to bad people, we have to conclude that God allows bad things to happen to good people. But in order to avoid the conclusion that God is the source of evil, we then have to assume that he must have some good purpose for making the bad things happen. So difficulties are 'sent to try us', to test our commitment and submission to him, or to build our character.
Those who respond by asking "Did I just get it wrong" also believe in God's sovereignty. But their theology allows more room for human beings to make choices that may not be God's will. God's sovereignty and control are demonstrated in the way in which he uses both our good and bad choices to work out his good purposes.
So how do we decide the cause of the set backs to our plans and the necessary action to take? It isn't easy. All three responses, all three theological understandings, have some support from scripture. If we become conscious of having sinned in the choices we've made, we should deal with that. But what if we've been doing what we believe is good and pleasing to God, and still run into difficulties?
Perhaps there's a lesson to be learned from Job, the book that deals most directly with the "why" behind unexpected set backs. As readers, we are told that Job's afflictions were the result of a strange heavenly conversation between God and Satan. But no-one told Job that.
Instead he was left to wrestle with his theology. Although Satan was the immediate cause of his afflictions, he never considered that option. Nor did he accept his wife's advice to give up. Unlike his friends, who piously reinterpreted his circumstances to fit their fixed theology, Job turned directly to God and asked "why?" He also asked "who?" - who is this God that I serve? In the end, he had fewer answers than when he started, but he also had a much deeper knowledge of God.