Job 13:9

Is it good that he should search you out? - Would it be to your credit if God should try your hearts, and uncover the motives of your conduct? Were you tried as I am, how would you appear?

Do ye so mock him? - Do ye think that you can deceive him; and by flattering speeches bring him to your terms, as you would bring an undiscerning, empty mortal, like yourselves?

Is it good that he should search you out? - Would it be well for you if he should go into an investigation of your character, and of the arguments which you adduce? The idea is, that if God should make such an investigation, the result would be highly unfavorable to them. Perhaps Job means to intimate that, if they were subjected to the kind of trial that he had been, it would be seen that they could not bear it. "Or as one man mocketh another." The idea here is, "it is possible to delude or deceive man, but God cannot be deceived. You may conceal your thoughts and motives from man, but you cannot from God. You may use arguments that may impose upon man - you may employ fallacies and sophisms which he cannot detect, but every such effort is vain with God;" compare Galatians 6:7.