Sarai’s unbelief goes to work. She is taking things into her own hands. Like Eve, she is trying to do herself what God said he would do. Hagar becomes the way that Sarai is going to earn what God said he would give — which means that Hagar becomes Sarai’s “salvation by works” project.
Do you know what that is? — a “salvation by works” project? Because everyone of us has one. We all have some kind of Hagar angle when it comes to the promises of God.