Mentally, I didn't get further than verse 2 with this chapter: "Pharaoh said, 'Who is the LORD, that I should obey him and let Israel go? I do not know the LORD and I will not let Israel go.'" Oh, be careful of the questions you ask!
The thing that occurred to me is that God wanted Pharaoh to know who He was! Pharaoh asked the absolute perfect question, and God was prepared to answer that question. Now, whether or not Pharaoh was pleased with the answer is something that will unfold over the next several chapters of Exodus. However, it struck me here that God answers our questions.
God doesn’t have to do anything He doesn’t want to do. He didn’t have to make us in the first place. And He certainly doesn’t have to stand for any type of questioning, let alone insubordination! But, He loves us. (He really can’t help Himself.) And because He’s a Lover, He wants to be known. He is more than happy to take whatever time is necessary to answer all of the questions we have about Him.
Personally, I think that the question Who is the Lord, and why should I obey Him? is one of the most exciting questions we could ever ask! And it’s all because we serve a God who loves and welcomes our questions... and honors us by answering them.