This is an excellent, straightforward look at the workings and output of Vatican II, written by the late John O'Malley, esteemed Jesuit Catholic historian. Using his vast erudition, O'Malley brings to life the immense complexity of Vatican II, providing the historical context to understand how it came to be, why it addressed the topics that it did, how different actors affected its outcome, and how it came to the opinions that it issued. He describes it as a response to the ideas and events of the "long nineteenth century," extending from the French Revolution in 1789 to the post-WW II period. He shows how each of the main ideas of Vatican II - updating the church, returning to original sources for inspiration, addressing the issues of central and peripheral control, ecumenism, church-state relations, reform of the liturgy - grew out of the need for the Catholic church to adapt to the new world it found itself in, and to shed medieval models that had come to seem eternal and unchangeable.
The book spends a lot of time with specific individuals, some well-known (John XXIII and Paul VI) and others less so. He addresses the dissenting voices, those whose opinion were not aligned with what has come to be known as the "spirit" of Vatican II." He wisely chooses to refer to the "majority," whose will is expressed to a large extent in the final documents of the conference, and the "minority," rather than using terms such as progressive or traditionalists. The role of Paul VI is perhaps the most difficult to assess, veering from thoughtful and even heroic gestures, to appearing to accommodate the minority, weakening the documents and at times pleasing nobody.
Although Vatican II occurred in my lifetime, it is still hard to believe some of the things that transpired, from the beginning in 1962 to the end in 1965. The meeting of the more than 2000 bishops, priests, and hundreds of observers, took place in St. Peter's Basilica, with the discussion of all but a few items taking place in Latin. (A few speakers spoke French.) Bishops debated the issue of church-state relations, with a sizable minority seeking to maintain the special status of the Catholic church in some countries, including prohibitions on proselytizing by other religions. The discussion of the relationship of the Catholic Church to Jews and to other religions revealed lingering prejudices, although in the end the document On Ecumenism was overwhelmingly approved. When Pope Paul VI went to visit the Holy Land at the beginning of 1964, it was the first time a pope had voluntarily left Italy in more than 500 years.
This book is the best single reference I know of for understanding Vatican II. At times it reads like a thriller, sort of a Dan Brown novel without all the idiotic parts. The fact that Catholics are still living with and debating the work of Vatican II is a testament to how essential it is to understand what happened there.