In the tradition of C.S. Lewis and Oswald Chambers, internationally renowned author and thinker Os Guinness has penned a classic reflective work on life's purpose. With his usual incisiveness, Guiness goes past our superficial understanding to the very heart of what calling means. Far bigger than our jobs, deeper than our personal accomplishments, higher than our wildest ideas of self-fulfillment, calling addresses the very essence of our existence.