The Index Librorum Prohibitorum listed books Catholics were forbidden to read without permission. It was formally abolished in 1966 and no longer has the force of ecclesiastical law — the plainest case in the whole section of a discipline being ended rather than adjusted.
“The Index retains its moral force, in that it teaches the conscience of the faithful to beware of writings that can endanger faith and morals; but it no longer has the force of ecclesiastical law with the attached censures.”
Whom it binds
- ·No book is forbidden by force of the Index today, and no censure attaches to reading one.
- ·The general moral obligation not to endanger one's own faith deliberately remains, as it would for anyone about anything.
- ·Separate norms still govern the granting of an imprimatur to Catholic works on faith and morals — that is a different thing, and it is permission to publish, not permission to read.
How the rule has moved
Watching a law change is the fastest way to learn it was never dogma.
- 1559
Paul IV publishes the first Roman Index, in the aftermath of the Reformation and the arrival of printing.
Index Librorum Prohibitorum, 1559 - 1564
The Council of Trent issues a revised and considerably more moderate Index with general rules.
The Tridentine Index, promulgated by Pius IV - 1897
Leo XIII reforms the rules substantially, easing much of what had accumulated.
Apostolic constitution Officiorum ac Munerum, 25 January 1897 - 1948
The final edition of the Index is published — the thirty-second.
Index Librorum Prohibitorum, 1948 edition - 1966
The Index is abolished: it keeps moral force as guidance but loses the force of law and its censures.
Congregation for the Doctrine of the Faith, Notification of 14 June 1966 · read it
What it was, and what it was not
The Index was a list, maintained in Rome, of books Catholics were forbidden to read or possess without permission — a permission that scholars could and routinely did obtain. It was aimed chiefly at works of theology, and at what the Church judged to be attacks on faith and morals; it was never a general catalogue of literature the Church disliked, and it contains far fewer famous novels than the popular impression suggests.
It also contained real errors of judgment, of which the most famous is the placing of the Copernican works on the Index in 1616 — a decision this site does not attempt to defend and which the Church herself has acknowledged. That is the nature of a disciplinary act: it can be prudent, imprudent, or wrong, and it can be undone.
Abolished, not quietly dropped
The 1966 notification was published under Cardinal Ottaviani, and its reasoning is instructive. It did not say the Index had been a mistake; it said the circumstances had changed. In a world of universal literacy and unrestricted publication, a list maintained in Rome could no longer do the work it was designed for, and the protection of the faithful had to rest instead on their formation.
The document is careful to add that the Church's concern for what is read has not lapsed — only that it is no longer expressed as a legal prohibition with penalties attached. This is what a discipline being ended, rather than abandoned, looks like.
Where it gets mistaken for doctrine
The Church still bans books.
She has not since 1966. No censure attaches to reading any book, and the Index has no legal force whatever.
Abolishing the Index means the Church admitted she had been wrong to care what people read.
The notification says the opposite — that the concern remains, and that the means have changed. She did concede specific judgments were wrong; that is different from conceding the whole enterprise was.
Why it matters
- ▤It is proof that a discipline can be ended entirely, with no doctrine disturbed — the single most useful fact in this section.
- ▤It is also an honest reminder that the Church's disciplinary judgments have sometimes been wrong, which is exactly what her own theology of discipline predicts is possible.
- ▤The obligation it enforced still exists in the ordinary way: do not deliberately feed yourself what you know will harm you.
Follow it further
Every citation on this page was checked against the document it names. Where a public text exists it is linked, so nothing here has to be taken on this site’s word. Where a claim could not be verified it was removed rather than left standing.