God called Sarah, too! We talk so much about God's call to Abraham that we can easily forget that God called Sarah as well. The story is told in Genesis 17. This old story begins with God's call to Abraham. It then moves to Sarah. "As for Sarah," God says, "she shall no longer be called Sarai but Sarah shall be her name." "I will bless her ..." God promises, "and she shall give rise to nations; kings of people shall come from her" (Genesis 17:16).

We can only imagine the solemnity of the moment when God made this promise to Abraham and Sarah. Abraham broke the solemnity. He fell on his face laughing at the very thought of God's promise. "Can a child be born to a man who is 100 years old?" Abraham laughed to himself. "Can Sarah, who is 90 years old, bear a child?" Abraham's laughter, it tu…