the source upon which he draws, but more frequently reproduces the sense rather than the exact words. I must hasten to add that the Talmudic commentaries of Rashi's masters were inadequate, and did not meet all needs. We can judge of the lacunae in them both from the commentaries that have been preserved and from the criticisms which Rashi frequently added as an accompaniment to his citations. Sometimes the commentaries were too diffuse, sometimes too concise; their language was obscure and awkward; no stress was laid upon explaining all details, and the commentaries themselves stood in need of explanation; they addressed themselves to accomplished Talmudists rather than to students. Rashi's commentaries, on the contrary, could be understood by men of small learning-hence their influence and popularity. Moreover, the commentaries of his masters often contradicted one another, coming as they did from scholars who did not shrink from discussion. Rashi wished to put an end to these debates and introduce some unity into rabbinical tradition, and generally his purpose in refraining from a quotation of his predecessors was exactly to avoid an opening into the field of controversy. Finally, their commentaries, it seems, were not comprehensive; they bore upon only one or several treatises; whereas Rashi's bore on all or nearly all the treatises of the Gemara.[95] With Rashi execution rose to the height of his conception. Rashi availed himself so little of the work of his masters that he began by establishing a correct text of the Talmud and subjecting it to a severe revision. The mistakes of his predecessors oftenest arose from the faultiness of the texts, marred by ignorant copyists or presumptuous readers. What is more, the use to which the Talmud was put in the academies and the discussions to which it gave rise, far from sheltering it from alterations made by way of correction, modified it in every conceivable fashion, according to the views of the chiefs of the schools. Like every book in circulation, the Talmud was exposed to the worst changes, and this all the more readily, because at that time no one had a notion of what we call respect for the text, for the idea of the author. As rigidly as the text of the Bible was maintained intact in the very minutest details, so lax was the treatment of the Talmud, which was at the mercy of individual whim. Naturally, the less scrupulous and less clearsighted allowed themselves the most emendations. Accordingly, Rabbenu Gershom felt called upon to put a severe restriction upon such liberties. Though he succeeded in moderating the evil, it could not be suppressed retroactively. Rashi realized that corrections made wittingly were indispensable, and that it was necessary to clear the Talmudic forest of entangling briers. Moreover, as we learn from Rashi himself, Gershom had already undertaken the task. Rashi also tells us that he had Gershom's autograph manuscript before him,