It was possible that the comforters would conclude that Job was so intransigent that no amount of good words could convince him. They might persuade themselves that their speeches had been full of helpful advice and sound admonition, but that they were dealing with a man who was so stubborn that nothing could get through to him.
God will of course judge all men and his judgment will penetrate to the core. All hypocrisy will be uncovered by him and no amount of deceit will succeed in preventing justice from doing its work. All stubbornness will crumble in his presence and each one will be naked before him. Nevertheless it is a shameful thing that there is no one among God’s people on earth who are capable of convincing a man who has gone astray of his errors, especially if that one is a believer and therefore capable of being convinced. It was unthinkable that Job, a true man of God, would remain intransigent and hold out until he encountered the judgment of God, when there were those among God’s people who were capable of convincing him of his error.
Barnes takes the view that the quotation from the comforters should end after the word ‘wisdom’, and that the final phrase is the expression of Elihu. Understood this way, Elihu is saying that although they claim to have answered Job, they have not done so, and the reason is that they have used their own wisdom, the wisdom of man, instead of the wisdom which comes from God, which Elihu is using. God will thrust Job down in this sense: by speaking through his servant, Elihu. The previous interpretation seems less strained, and given what the book says about the comforters’ failure to convince Job (Job 32:1), and what Elihu says about this in the next verse, it is unlikely that they were claiming to have answered Job adequately.