When we read God’s reply, we are tempted to summarized it as "I am God. You are not. Deal with it!"?
God’s opening words in this extended speech, and then the content of the speech itself, may point in a somewhat different direction. "Who darkens counsel?" God asks, (verse 2). The word translated "counsel" in Hebrew is "ey-tsah." There are two primary contexts in which this word appears in ancient Hebrew. One relates to the advice peers share (their counsel) when they are trying to help each other make a good decision. The other relates to the courtroom, where a judge provides the final word ("counsel") about what happened and what is to be done.
It is the latter that seems to apply here. Job has been asking all throughout the drama for the opportunity to meet God in court, for God to hear his complaint, and for God to respond to it. The rhetoric of God’s first response seems to indicate that that is exactly what God is doing in the chapters to follow. God has appeared. God is judge. And God will set the record straight.
What may seem like an endless barrage of almost taunting interrogations that follow in the next four chapters serves a different purpose. There may indeed be a bit of "rant" here, but this isn’t about God letting off steam. The God revealed here has no need to do so! Instead, rather than taunts, God’s questions are revelations. The questions God poses open up the hearers to the wonders of the earth and the universe (chapters 38-39) and to the extent of God’s power in human and heavenly affairs (chapters 40-41). The effect is not to bully Job into submission but to enlighten his "darkened counsel," not to subdue Job but to blow his mind — and, consequently, ours. It is not to assert superiority, but rather to help Job know God and God’s work more than he (or we) could have done before. The desired response is not cowering in terror or humiliation, but standing in awe.
When God deals with us, He seeks the same experience.