Whenever someone is suffering or going through trials, we wonder what they did to deserve such pain. God must have a reason for causing trials and tribulations.
But what about what we read in chapter 1 about God saying that Job was blameless? So...Job didn't 'deserve' this? Well, we know that it wasn't a cause of some un-confessed sin lingering in his life.
Job recognizes who God is.
But how can a person be declared innocent in God's sight? If someone wanted to take God to court, would it even be possible to answer him even once in a thousand times? For God is so wise and so mighty. Who has ever challenged him successfully?"