In these final verses Bildad seems to offer Job some hope of recovery. Verse 20 is linked to verses 21-22, and should be understood in a positive sense, as an encouragement to Job, though it also has a warning attached to it.
Job for the time being had to continue under affliction, not know why it was sent, and being required to trust still in the goodness of God. On top of this, he had to resist the pressure of false explanations and false remedies for his condition. Peter tells us that such trials work for our eternal good, and that God allows them ‘that the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ’ (1 Peter 1:7). Faith is able to deal with confusion when our circumstances become too hard to interpret, by holding onto what we do know and leaving with the Lord what we do not know.