Albert Barnes Commentary Job 9:16

"If I had called, and he had answered me, Yet would I not believe that he hearkened unto my voice." — Job 9:16 (ASV)

If I had called, and he had answered me - It is remarked by Schultens that the expressions in these verses are all taken from courts of justice. If so, the meaning is that even if Job were to call the Almighty to a judicial action, and God were to respond to Job and consent to submit the great question about Job's innocence and the justice of the divine dealings with him to trial, yet such was the distance between God and Job that Job could not hope to successfully contend with Him in the argument. Job would, therefore, prostrate himself in a suppliant manner, and implore God's mercy and compassion—submitting to Him as having all power and as being a just and righteous Sovereign.

Would I not believe - I cannot believe that He would enter into my complaint. He deals with me in a manner so severe; He acts toward me so much as a sovereign, that I have no reason to suppose that He would not continue to act toward me in the same way.