John Cortines and Gregory Baumer met as Harvard MBA candidates in a men's Bible study and stopped asking "How much should I give?" and started asking "How much do I need to keep?" With their top-notch education and rising careers, Cortines and Baumer were guaranteed comfort and security for the rest of their lives. However, when their plans for saving and spending collided with God's purposes for extravagant generosity, they were each compelled to...