Job's final words was to claim that God was at fault for what he was going through and all the abuses he had received from his friends. His claim was, based on what he had previously done, he did not deserve the things happening to him. Job was making the same mistakes he is scolding his friends for, however, in reverse. They were wrong to claim what was happening must be as a result of something Job did wrong. But Job was also wrong to claim his actions do not deserve his experience, as if God was being unfair. In the end, all of our good deeds, in God's eyes, at best are like filthy rags. Instead, our perspectives should be; thank you Lord for helping me to do this and that.