Pope Francis is cheered by faithful as he arrives to preside over the Sunday mass in King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Pope Francis waves as he arrives to lead the holy mass , at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Pope Francis is cheered by faithful as he arrives to preside over the Sunday mass in King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Faithful wait for the start of a mass presided by Pope Francis at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Pope Francis is cheered by faithful as he arrives to preside over the Sunday mass in King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Pope Francis holds the pastoral staff as he presides over the Sunday mass at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Queen Mathilde and King Philippe arrives to attend the holy mass by Pope Francis at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Faithful wait for the start of a mass presided by Pope Francis at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Pope Francis is greeted by Archbishop Luc Terlinden during the farewell ceremony at Melsbroek Air Base at the end of a four-day visit to Belgium and Luxembourg, Sunday, Sept. 29, 2024. (AP Photo/Geert Vanden Wijngaert)

Kids listen Pope Francis as he presides the holy mass , at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

A faithful prays as Pope Francis presides the holy mass , at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

A priest holds a rosary prior to the start of a mass presided by Pope Francis at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Pope Francis presides over the Sunday mass at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Pope Francis arrives to lead the holy mass , at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Faithful listen as Pope Francis presides the holy mass , at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Pope Francis waves as he arrives to lead the holy mass , at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Pope Francis waves to photographers during the farewell ceremony at Melsbroek Air Base at the end of a four-day visit to Belgium and Luxembourg, Sunday, Sept. 29, 2024. (AP Photo/Geert Vanden Wijngaert)

Faithful wait for the start of a mass presided by Pope Francis at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini)

Pope Francis talks to journalists on the flight back to Rome at the end of his four-day visit to Belgium and Luxembourg, Sunday, Sept. 29, 2024. (AP Photo/Andrew Medichini, Pool)

Pope Francis presides over the Sunday mass at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

A faithful reads a book as Pope Francis presides the holy mass, at the King Baudouin stadium in Brussels, Belgium, Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)

Pope Francis is greeted by Cardinal Jozef De Kesel during the farewell ceremony at Melsbroek Air Base at the end of a four-day visit to Belgium and Luxembourg, Sunday, Sept. 29, 2024. (AP Photo/Geert Vanden Wijngaert)

Pope Francis sits on his wheelchair as he presides over the Sunday mass at King Baudouin Stadium, in Brussels Sunday, Sept. 29, 2024. (AP Photo/Omar Havana)