When ought we to share what we believe, and when are we just picking a fight?

At the Transatlantic Christian Council in Washington, D.C., this month, Ray Pennings asked Os Guinness about this topic. Guinness is the author of nearly two dozen books, most recently The Global Public Square: Religious Freedom and the Making of a World Safe for Diversity and Renaissance: The Power of the Gospel However Dark the Times.

"If we look at the scriptures, or down through history," says Guinness, "an incredibly key part of Christian communication is persuasion."

"I think we should be persuasive—publicly accessible—as St. Paul was," argues Guinness. "So when he's in a synagogue, he preaches from the Torah. When he's on Mars Hill, he quotes Cretan poets and philosophers. We should have that adaptability and flexibility."