Priests 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)

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 delivers his message as he meets with students of the Louvain Catholic University in Ottignies-Louvain-la-Neuve, Belgium, Saturday, Sept. 28, 2024. (AP Photo/Andrew Medichini)

Pope Francis delivers his message as he meets with students of the Louvain Catholic University in Ottignies-Louvain-la-Neuve, Belgium, Saturday, Sept. 28, 2024. (AP Photo/Andrew Medichini)

Pope Francis wears a traditional hat at the end of his meeting with students of the Louvain Catholic University in Ottignies-Louvain-la-Neuve, Belgium, Saturday, Sept. 28, 2024. (AP Photo/Andrew Medichini)

Pope Francis cheers faithful at the end of his meeting with students of the Louvain Catholic University in Ottignies-Louvain-la-Neuve, Belgium, Saturday, Sept. 28, 2024. (AP Photo/Geert Vanden Wijngaert)

Pope Francis attends the Hope Happening youth festival at the Brussels Expo, Belgium, Saturday, Sept. 28, 2024, on the third day of his four-day visit to Luxembourg and Belgium. (AP Photo/Andrew Medichini)

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)