In a letter to a friend, Jesuit theologian and mystic Karl Rahner offers a recipe for preparing for Christmas, something to augment (and arguably even replace) the "emotionally appealing customs which are...only kept up with a certain skepticism." We ought not to bumble into Christmas, or really any of the great feasts, he argues. Have a plan. And have the courage to not only listen to God, but to let God listen back.