“Gutenberg’s press flooded the market. In the early 1500s John Tetzel, the head pardoner for German territories, would sweep into a town with a collection of already printed indulgences, hawking them with a phrase usually translated as “When a coin a coffer rings / A soul for heaven springs.” The nakedly commercial aspects of indulgences, among other things, enraged Martin Luther, who in 1517 launched an attack on the Church in the form of his famous Ninety-five Theses. He first nailed the theses to a church door in Wittenberg, but copies were soon printed up and disseminated widely. Luther’s critique, along with the spread of Bibles translated into local languages, drove the Protestant Reformation, plunging the Church (and Europe) into crisis. The tool that looked like it would strengthen the social structure of the age instead upended it. From the vantage point of 1450, the new technology seemed to do nothing more than offer the existing society a faster and cheaper way to do what it was already doing. By 1550 it had become apparent that the volume of indulgences had debauched their value, creating “indulgence inflation”—further evidence that abundance can be harder for a society to deal with than scarcity. Similarly, the spread of Bibles wasn’t a case of more of the same, but rather of more is different—the number of Bibles produced increased the range of Bibles produced, with cheap Bibles translated into local languages undermining the interpretative monopoly of the clergy, since churchgoers could now hear what the Bible said in their own language, and literate citizens could read it for themselves, with no priest anywhere near. By the middle of the century, Luther’s Protestant Reformation had taken hold, and the Church’s role as the pan-European economic, cultural, intellectual, and religious force was ending.”

Tractatus de indulgentiis per Doctorem Martinum ordinis s. Augustini Wittenbergae editus., or, A Treatise on Indulgences Published by Doctor Martin of the Order of St. Augustine in Wittenberg. To Archbishop Albrecht of Mainz (31 October 1517) Luther's "forgotten" treatise was found in the Mainz archives “among the papers making up the correspondence between Archbishop Albrecht and the Mainz University faculty in December 1517” and published by F. Herrmann in the Zeitschrift für Kirchengeschichte (ZKG) in 1907, vol. 28, pp. 370-373. Catholic Luther scholar Jared Wicks S. J. believes this early treatise to be of considerable historical significance: "This document is the short treatise sketching a tentative theology of indulgences which Luther sent to Archbishop Albrecht of Mainz and Magdeburg on that fateful October 31, 1517. The other two documents of Luther's intervention are well known. First, there was the respectful, though urgent letter to the Archbishop in which Luther related the misunderstandings being spread by Tetzel's preaching and in which he begged the Archbishop to issue new instructions which would bring Tetzel under control. Secondly, there was the list of Latin theses on the doctrine and practice of indulgences which Luther intended to use as the basis of a theological discussion of the many vexed questions in this area. The third document sent to Albrecht, Luther's treatise, has not received the attention it deserves from historians and theologians studying the beginning of the Reformation. This is most regrettable, since the treatise depicts in orderly and succinct fashion Luther's understanding of indulgences in 1517 and reveals his conception of their limited role in Christian living. The treatise gives us the theological standpoint on which Luther based his intervention, and it shows in miniature the rich Augustinian spirituality of penance and progress that he had forged in his early works. ...[T]he great tragedy of 1517 was that the barbed [95] theses spread over Germany in a matter of weeks, and this penetrating little treatise fell into dusty oblivion."
Martin Luther's Treatise on Indulgences, Theological Studies 28 (1967), pp. 481-482, 518. http://www.google.com/search?tbm=bks&hl=en&q=%22forgotten+document+in+luther%27s%22&btnG=#hl=en&q=%22forgotten%20document%20in%20luther%27s%22&um=1&bpcl=35466521&psj=1&ie=UTF-8&sa=N&tab=pw&psj=1&ei=Y-6JUJ-mL4eo8gShuYDIBQ&bav=on.2,or.r_gc.r_pw.r_qf.&fp=e5b835ba41618e18&biw=1232&bih=702 http://www.google.com/search?tbm=bks&hl=en&q=%22forgotten+document+in+luther%27s%22&btnG=#hl=en&q=%22forgotten+document+in+luther%27s%22&um=1&bpcl=35466521&psj=1&ie=UTF-8&tbo=u&tbm=bks&source=og&sa=N&tab=wp&psj=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=4fa257fccf8e3a83&biw=1232&bih=702