Job 37:19 - Matthew Poole's English Annotations on the Holy Bible

Unto him, i.e. unto God, either by way of apology for thee; or rather, by way of debate and disputation with him about his counsels and ways: about which we know not what to say, and therefore are willing to be taught by thee, who pretendest to such exquisite knowledge of these matters. So it is a reproof of his presumption and arrogance. We cannot order our speech; we know neither with what words or matter, nor in what method and manner, to maintain discourse with him, or plead against him. The words our speech are easily understood out of the former clause of the verse. By reason of darkness; both because of the darkness of the matter, God's counsels and ways being a great depth, and far out of our reach; and because of the darkness or blindness of our minds.