Catholic ecclesiology

A stained glass window in a Catholic church depicting St. Peter's Basilica in Rome sitting "Upon this rock," a reference to Matthew 16:18. Most present-day Catholics interpret Jesus as saying he was building his church on the rock of the Apostle Peter and the succession of popes which claim Apostolic succession from him.
A 17th century illustration of Article VII: Of the Church from the Augsburg Confession, which states "one holy Church is to continue forever. The Church is the congregation of saints, in which the Gospel is rightly taught and the Sacraments are rightly administered." Here the rock from Matthew 16:18 refers to the preaching and ministry of Jesus as the Christ, a view discussed at length in the 1537 Treatise.

Catholic ecclesiology is the theological study of the Catholic Church, its nature, organization and its "distinctive place in the economy of salvation through Christ". Such study shows a progressive development over time being further described in revelation or in philosophy. Here the focus is on the time leading into and since the Second Vatican Council (1962–1965).

Pope Paul VI stressed the importance of the church's self-knowledge in his first encyclical letter, Ecclesiam Suam:

We are convinced that the Church must look with penetrating eyes within itself, ponder the mystery of its own being, and draw enlightenment and inspiration from a deeper scrutiny of the doctrine of its own origin, nature, mission, and destiny.