God chooses Abraham and Sarah, a child-less couple advanced in years, at a time when having children signified God's blessing and favor. Then, God promises all people will be blessed by Abraham and Sarah's descendants. In return, the couple choose to follow God leaving their family and home. While they are admired for trusting in God, we also see their messy and sinful lives. Even when Abraham and Sarah mess up and make mistakes, God stands by his promise. He doesn't give up on them.