The aim of this article is to present some considerations on the Dogmatic Constitution Lumen Gentium, considered the central document of the Second Vatican Ecumenical Council, as well as reaffirming its importance for the Church even today. In the first section, the text briefly recounts the history of the drafting of the text in the sessions in which it was discussed, until it became the document approved by the bishops and promulgated by Pope Paul VI on November 21, 1964. The second section analyzes the order of the chapters in the text of the document, its novelty, the key ideas, the insertion of the schema on Mary and, finally, the Preliminary Note. The third section looks at some of the theological aspects of the document, without pretending to be exhaustive in view of the richness of the text, including renewal in continuity, the Trinitarian perspective, the place and role of the laity in the Church, and concludes with a frequently asked question: What ecclesiology is found in Lumen Gentium? This Dogmatic Constitution deserves to be revisited so that it can be given its rightful place in current ecclesiological thinking.