Albert Barnes Commentary Job 40:14

"Then will I also confess of thee That thine own right hand can save thee." — Job 40:14 (ASV)

Then will I also confess unto thee ... - If you can do all this, it will be full proof that you can save yourself, and that you do not need divine intervention. If he could do all this, then it might be admitted that he was qualified to pronounce a judgment on the divine counsels and dealings. He would then show that he had qualifications for conducting the affairs of the universe.