VATICAN CITY (AP) — Pope Francis says he is looking for a “sincere, open and fraternal” debate about divisive family issues that opens Sunday with progressives hoping for change and conservatives intent on keeping the status quo.

Francis made a cameo appearance Saturday at a twilight prayer vigil in St. Peter’s Square on the eve of a two-week meeting of bishops aimed at making the church’s teaching on sex, marriage, divorce and homosexuality relevant to today’s Catholics.