Job 36:11 If they obey and serve him, they shall spend their days in prosperity, and their years in pleasures.
The problem that the Book of Job wrestles with is whether or not piety brings material prosperity and earthly pleasure. The book gives the lie to that conventional wisdom. The answer is a resounding NO! There is no direct cause and effect correlation between the two. However, Elihu is still pressing the point, implicitly accusing Job of not obeying and serving the Lord. Since Job is suffering such great loss it must be that he has not repented of his sins. In the end Job got it right and the friends did not speak what was right about God.
Meanwhile, the conditional promise Elihu speaks of here is still true spiritually and eternally. If we could and would obey God, then we will have prosperity and pleasures. We can’t and we don’t. But Jesus obeyed the Father for us, living a righteous life and dying an innocent death. He gives us His life and death by grace and we receive it by faith. Therefore, we enjoy spiritual prosperity and eternal pleasures now and forevermore.
When we believe this Gospel Promise we wallow in the riches of His glory from which God will supply every need of ours, and we revel in the spiritual pleasures of the Kingdom of God. This prosperity and pleasure is not fleeting, as the world’s wealth and thrills are, but deep, abiding, and eternal.