quality:corruption, linguistic:voice_change, structural:expansion, information:filtering
Censorship

As one manifestation of the Counter-Reformation, the Spanish Inquisition worked actively to impede the diffusion of heretical ideas in Spain by producing "Indexes" of prohibited books. Such lists of prohibited books were common in Europe a decade before the Inquisition published its first. The first Index published in Spain in 1551 was, in reality, a reprinting of the Index published by the University of Leuven in 1550, with an appendix dedicated to Spanish texts. Subsequent Indexes were published in 1559, 1583, 1612, 1632, and 1640.

Included in the Indices, at one point, were some of the great works of Spanish literature, but most of the works were religious in nature and plays. A number of religious writers who are today considered saints by the Catholic Church saw their works appear in the Indexes. At first, this might seem counter-intuitive or even nonsensical—how were these Spanish authors published in the first place if their texts were then prohibited by the Inquisition and placed in the Index? The answer lies in the process of publication and censorship in Early Modern Spain. Books in Early Modern Spain faced prepublication licensing and approval (which could include modification) by both secular and religious authorities. Once approved and published, the circulating text also faced the possibility of post-hoc censorship by being denounced to the Inquisition—sometimes decades later. Likewise, as Catholic theology evolved, once-prohibited texts might be removed from the Index.

At first, inclusion in the Index meant total prohibition of a text. This proved not only impractical and unworkable but also contrary to the goals of having a literate and well-educated clergy. In time, a compromise solution was adopted in which trusted Inquisition officials blotted out words, lines or whole passages of otherwise acceptable texts, thus allowing these expurgated editions to circulate. Although in theory, the Indexes imposed enormous restrictions on the diffusion of culture in Spain, some historians argue that such strict control was impossible in practice and that there was much more liberty in this respect than is often believed. And Irving Leonard has conclusively demonstrated that, despite repeated royal prohibitions, romances of chivalry, such as Amadis of Gaul, found their way to the New World with the blessing of the Inquisition. Moreover, with the coming of the Age of Enlightenment in the 18th century, increasing numbers of licenses to possess and read prohibited texts were granted.

Despite the repeated publication of the Indexes and a large bureaucracy of censors, the activities of the Inquisition did not impede the development of Spanish literature's " Siglo de Oro ", although almost all of its major authors crossed paths with the Holy Office at one point or another. Among the Spanish authors included in the Index are Bartolomé Torres Naharro, Juan del Enzina, Jorge de Montemayor, Juan de Valdés and Lope de Vega, as well as the anonymous Lazarillo de Tormes and the Cancionero General by Hernando del Castillo. La Celestina, which was not included in the Indexes of the 16th century, was expurgated in 1632 and prohibited in its entirety in 1790. Among the non-Spanish authors prohibited were Ovid, Dante, Rabelais, Ariosto, Machiavelli, Erasmus, Jean Bodin, Valentine Naibod and Thomas More (known in Spain as Tomás Moro). One of the most outstanding and best-known cases in which the Inquisition directly confronted literary activity is that of Fray Luis de León, noted humanist and religious writer of converso origin, who was imprisoned for four years (from 1572 to 1576) for having translated the Song of Songs directly from Hebrew.

One of the main effects of the inquisition was to end free thought and scientific thought in Spain. As one contemporary Spaniard in exile put it: "Our country is a land of pride and envy... barbarism; down there one cannot produce any culture without being suspected of heresy, error and Judaism. Thus silence was imposed on the learned." For the next few centuries, while the rest of Europe was slowly awakened by the influence of the Enlightenment, Spain stagnated. This conclusion is contested.

The censorship of books was actually very ineffective, and prohibited books circulated in Spain without significant problems. The Spanish Inquisition never persecuted scientists, and relatively few scientific books were placed on the Index. On the other hand, Spain was a state with more political freedom than in other absolute monarchies in the 16th to 18th centuries. The apparent paradox gets explained by both the hermeticist religious ideas of the Spanish church and monarchy, and the budding seed of what would become Enlightened absolutism taking shape in Spain. The list of banned books was not, as interpreted sometimes, a list of evil books but a list of books that lay people were very likely to misinterpret. The presence of highly symbolical and high-quality literature on the list was so explained. These metaphorical or parable sounding books were listed as not meant for free circulation, but there might be no objections to the book itself and the circulation among scholars was mostly free. Most of these books were carefully collected by the elite. The practical totality of the prohibited books can be found now as then in the library of the monasterio del Escorial, carefully collected by Philip II and Philip III. The collection was "public" after Philip II's death and members of universities, intellectuals, courtesans, clergy, and certain branches of the nobility didn't have too many problems to access them and commission authorised copies. The Inquisition has not been known to make any serious attempt to stop this for all the books, but there are some records of them "suggesting" the King of Spain to stop collecting grimoires or magic-related ones.