Francisco advised the young people to recognize their worth, for what they are and not for what they have and said that they live prisoners of their cell phones.
According to the pope, who visits Greece, "authoritarianism is swift and the easy promises proposed by populism are attractive."
Francis must address issues of migration and division of Cyprus. He arrives in Nicosia today for the first leg of a five-day visit.
According to the World Health Organization, around 37.7 million people were living with HIV at the end of 2020, more than two-thirds in Africa.
Before returning to the Vatican, Pope Francis went to the Basilica of St. Mary Major to pray for the sick and thank the success of the surgery.