In Holy Baptism we receive a new birth: spirit from Spirit. With that rebirth we receive new desires, new lives, new purposes. To the (fleshly) world, Christian generosity makes no sense: the total minus a percentage is less than the original total. But Spirit-reborn Christians know that God’s math works differently (as we might expect from the Trinity!). A blessing received from God becomes more of a blessing when it is used in generosity to bless others.