Job is a mixture of many things, it talks about faith, temptation, fear, anger, many values and feelings humans experience everyday. The chapter I liked the most was 28, in which the translation talked about wisdom, and where to find it. It gave great examples, which made me realize we have alot of wisdom. We know where to get gold, how to molt brass and how to make bread. Such simple things had to be discovered at one point, and I think that as soon as they were discovered, they were considered s0me great invention.
But, where did the wisdom to learn all these things come from? It can't be bought with gold or traded for silver. It isn't made of pearls or coral. "The gold and the crystal cannot equal it". According to the bible, wisdom comes from fearing God and only listening to him. "Behold, the fear of the Lord, that is wisdom; and to depart from evil is understanding." I believe wisdom comes from experience and perseverance. When you need to survive, when you need to make a progress, you keep trying and don't give up until you have achieved your goal. In the way to success you may fall and make mistakes. These mistakes are the ones that help you gain more wisdom, which also helps you gain experience.
God's purpose was to be feared, I believe this is because he thought that is he was feared, he was respected. God manipulated men making them believe they could gain such things as wisdom from fearing and respecting him. This made humans depend on God, follow and respect him, but we acquired wisdom and found out we didn't need to depend on God, therefore, there was no reason to follow or fear him anymore.