"The kingdom of heaven is like treasure hidden in a field. When a man found it, he hid it again, and then in his joy went and sold all he had and bought that field." --Matthew 13:44

The Calling follows seven emerging religious leaders as they embark on their journeys as pastors, preachers, priests, chaplains, imams and rabbis.

We've gone throughout the country, exploring the subtleties of calling. We started with one question: What does calling mean to you? From there conversations went far afield.

When I began to work on The Calling, my PBS documentary series on clergy students, I set out to look at faith in the U.S. with a keen eye and a warm heart.

As the great theologian Howard Thurman put it, "Ask yourself what makes you come alive and go do that, because what the world needs is people who have come alive."