Zip It: The Keep it Shut 40 Day ChallengeZip It empowers readers to put into action the advice and commands of Scripture concerning the tongue. Zip It empowers readers to put into action the advice and commands of Scripture concerning the tongue. The New York Times bestselling book Keep It Shut covered many topics including anger, truth telling, people pleasing, and both online and in person gossip. With more than 3,500 verses in the Bible that relate to speech and silence, Keep It Shut