As a result of Job's faithfulness while going through trials and times of suffering, God not only restored his life 10 fold, but revealed to man, as never before, the spiritual reality of life beyond sheol or the grave. God chooses His time and place to reveal truth to humanity. This passage from Job is a great example of God's progressive revelation to humanity. As God has worked with His people He has revealed more and more about Himself, life, salvation, etc.