Moses is at work. The text gives us no indication that he is seeking God or that he has spent much time thinking about what had happened to him in Egypt and what is still happening there. But, God has been thinking about these things.
But, when God impinges on Moses' life, Moses does notice. When God sees that Moses is willing to let the everyday stuff be laid aside, God calls to him.
"I have seen the misery of my people who are still in Egypt. I have heard their cry. I have come down to rescue them, to bring them to a good land, a land flowing with milk and honey."
Rescue, though not immediate, is imminent.
Then God tells Moses how this rescue is going to be effected: "I'm sending you."
Several questions arise for me as I think about this passage. How many times does God make a dramatic appearance in our not-so-dramatic lives, and we don't even notice? How many times are we compelled to come closer to God, to recognize a holy time and place, and we don't respond? Should we expect God to know our suffering? Do we recognize God's behind-the-scenes work in our rescue from that suffering? Does everyone, or anyone, respond positively to the call of God if it is to do something as dangerous as face a Pharaoh?