Pope Francis has warned the Catholic Church would become "a compassionate NGO" without spiritual renewal.
In a Sistine Chapel Mass with cardinals on his first day as Church leader, the pontiff said: "If we do not confess to Christ, what would we be?
"We would end up a compassionate NGO. What would happen would be like when children make sand castles and then it all falls down."
Francis is the first Latin American—and the first Jesuit—Pope.