ROME (AP) — Pope Leo XIV on Sunday told more than a million Catholic youths at a closing Mass for a weeklong encounter with the next generation of faithful that they are “the sign that a different world is possible” where conflicts can be resolved with dialogue, not weapons.

The pontiff was greeted Aug. 2 by joyous crowds on the 237-acre grounds of the University of Rome Tor Vergata, 10 miles east of Rome.