According to Randy Alcorn, whose books on giving include The Treasure Principle and Money, Possessions, and Eternity, giving is a “powerful witness of the gospel” that he calls the “greatest form of evangelism.” Alcorn said that giving in tough economic times is particularly important for the Christian. “For one thing, in tough times Christian charity is needed all the more,” he said. “For another, the testimony of that giving is even more profound. Giving in tough times tells the world that it is God’s providence, not a large checking account, that is the source of our sustenance and security.” It’s possible that Christians are getting this message. According to Philanthropy Journal, arts and cultural organizations have seen giving declines. And high-profile ministries such as Focus on the Family have announced layoffs and budget shortfalls. But the nation’s largest Christian relief organizations—including World Vision, Compassion International, and Samaritan’s Purse—all report 2008 giving increases.