He was angry because he thought God was unfairly tormenting him and allowing his friends to think he was suffering for some terrible secret sin. Finally, after lengthy, frustrated, and angry conversations between Job and his friends, God Himself spoke. From out of a violent whirlwind, the Creator captured Job's attention and challenged him to take another look at the natural world. The Lord asked Job to consider ecology, the animals, and the patterns of weather and seasons He had made. The purpose of the Creator's interrogation was for Job to understand from the world around Him that a God who is wise and powerful enough to have created the natural world is certainly great enough to know what He is doing in allowing Job's suffering.
Smallness gets ever smaller, and bigness gets ever bigger.
It is the revelation that has been given to all people, in all times, and in all places. By observing the creation carefully and reverently to discover the countless ways it reveals God and His attributes to us.