Job was totally at loose ends, not knowing what God's intentions with him were. V. 10, despite all the trials Job was going through, he never lost sight of God's providence. Job was still confident that God knew where he was, and what was going on. Though his friends were falsely accusing him, Job was confident the Lord would be just. Job also knew that though he had taken the wrong path at times, the Lord knew that his desire was at all times to take the right path and do the right thing.
Gold goes into the furnace, and it comes out as gold.
Gold is precious to the refiner, and his desire is not to lose the gold, nor to decrease its value. The furnace is to increase the value of the gold for its owner. God's word is the only rule to walk by. And without this necessary food, we will perish in the trials that come our way. Job did not feel God's favor nor presence, yet he was assured that what was taking place was for his own good.