Pope Francis on Dec. 24 officially launched the Vatican's 2025 Jubilee Year, encouraging Christians to use the milestone occasion to dream of a "new world where peace and justice reign."

He made the remarks a day after the start of the Roman Catholic Church’s Holy Year, known as a Jubilee, which takes place every quarter century. On Tuesday evening, Francis opened the Holy Door in St. Peter’s Basilica so that the first pilgrims could go through. Millions more are expected to follow over the year.

The major tenants of the Church's jubilee, a once-every-25-year tradition, include forgiveness and reconciliation with adversaries, as well as pilgrimages to Rome.