You know that feeling you get when someone makes you a big promise? You probably feel excited, but you might feel a little skeptical too — especially when that promise gets delayed . . . and delayed again . . . and again. If you have to wait long enough for something you were promised, you might start to wonder when you've waited long enough. Eventually, you might even give up hope. This week, you'll introduce students to the story of Abraham and Sarah, who waited on God for their son Isaac.