In the wake of White House counterterrorism advisor John Brennan’s speech on drone ethics and targeted killing, we talk to Yale Law School professor Stephen Carter, author of The Violence of Peace: America’s Wars in the Age of Obama.

Using ancient Chinese spiritual principles, says Raymond Lo, a feng shui grand master in Hong Kong, “we can establish where is the good energy and where is the bad energy.”

Watch excerpts from a 2010 speech GOP presidential candidate Rick Santorum, a Catholic, delivered in Houston, Texas, on the role of religious faith in public life. The speech was given to mark the 50th anniversary of JFK's famous 1960 speech to the Greater Houston Ministerial Association, a speech Santorum claims told people of faith they have no role in the public square.

Purposefulness and self-sacrifice in human life "can never be reduced to a machine," according to this bioethicist.

"Is there a point at which a change of heart no longer means anything to God?" Watch more of our interview with pastor and author Rob Bell.

"Nothing Rob Bell has said is new," says author and columnist Lisa Miller. "There has been this long conversation for twenty-five hundred years about what heaven is and who gets to go."

"Religion isn’t bad, but until religion becomes actual spiritual experience, it is just religion," says this sometimes controversial Franciscan priest and author.

The September 30 killing in Yemen of radical cleric Anwar al-Awlaki is reigniting an ethical debate: Should the US use armed drones outside combat zones? Watch excerpts from recent interviews on drones and the ethics of war.

“You’re not tolerant,” says this Christian philosopher, “if you're indifferent. You're tolerant if you disapprove of the other person's religion but put up with it nonetheless."

When disaster strikes, the character of a culture is revealed, and in Japan, perceptions of disaster are deeply rooted in traditional religious culture.