MercyMe’s lead singer Bart Millard had no idea when he wrote the mega-hit song “I Can Only Imagine,” after the loss of his dad to cancer, how that message of hope would touch people around the world. Almost two decades later, the much-anticipated movie, “I Can Only Imagine,” opens in theaters March 16 based on Millard’s new memoir chronicling the unexpected journey of his life. For those seeking reassurance in the face of despair, you’ll be inspired when you listen to Nancy Turner’s interview with Bart Millard on this week’s This is the Day podcast.