William Rodríguez, in charge of cleaning one of the towers of the World Trade Center in New York, rescued more than twenty people on the day of the 2001 terrorist attacks. In addition, he was opening the way for the firefighters with a master key, allowing dozens of other people to escape. He himself was in danger of dying and took cover under a fire truck, an experience that made him return the next day to help. He was grateful to live, and so he tirelessly wanted to seek others. Where did he get the strength to return to the place?