Fifty years after Nick Ut took one of the most famous photographs of the Vietnam War—a picture of a young girl, Phan Thi Kim Phuc, fleeing a napalm attack—the pair met with Pope Francis on May 11.

In 2017, Kim Phuc wrote a memoir and Wall Street Journal article in which she discussed her conversion to Christianity. “I still need treatment for the burns on my arms, back and neck,” she said. “But my heart is healed.”