In the first chapter of the Dogmatic Constitution on the Church (also called Lumen Gentium), the council Fathers proclaim the Church as “mystery.” What an extraordinary introduction to the nature of the Church. Lumen Gentium has been called the most pivotal achievement of the Vatican II Council. This document underwent the most extensive revisions and rewrites of all the conciliar documents before its final promulgation. Every word received painstaking scrutiny