The interest which Maimonides now took in communal affairs did not prevent him from completing the great and arduous work, the Commentary on the Mishnah, which he had begun in Spain and continued during his wanderings in Africa. In this Commentary he proposed to give the quintessence of the Gemara, to expound the meaning of each dictum in the Mishnah, and to state which of the several opinions had received the sanction of the Talmudical authorities. His object in writing this work was to enable those who are not disposed to study the Gemara, to understand the Mishnah, and to facilitate the study of the Gemara for those who are willing to engage in it. The commentator generally adheres to the explanations given in the Gemara, and it is only in cases where the halakah, or practical law, is not affected, that he ventures to dissent. He acknowledges the benefit he derived from such works of his predecessors as the Halakot of Alfasi, and the writings of the Geonim, but afterwards he asserted that errors which were discovered in his works arose from his implicit reliance on those authorities. His originality is conspicuous in the Introduction and in the treatment of general principles, which in some instances precedes the exposition of an entire section or chapter, in others that of a single rule. The commentator is generally concise, except when occasion is afforded to treat of ethical and theological principles, or of a scientific subject, such as weights and measures, or mathematical and astronomical problems. Although exhortations to virtue and warnings against vice are found in all parts of his work, they are especially abundant in the Commentary on Abot, which is prefaced by a separate psychological treatise, called The Eight Chapters. The dictum “He who speaketh much commits a sin,” elicited a lesson on the economy of speech; the explanation of ʻolam ha-ba in the treatise Sanhedrin (xi. 1) led him to discuss the principles of faith, and to lay down the thirteen articles of the Jewish creed. The Commentary was written in Arabic, and was subsequently translated into Hebrew and into other languages. The estimation in which the Commentary was held may be inferred from the following fact: When the Jews in Italy became acquainted with its method and spirit, through a Hebrew translation of one of its parts, they sent to Spain in search of a complete Hebrew version of the Commentary. R. Simḥah, who had been entrusted with the mission, found no copy extant, but he succeeded, through the influence of Rabbi Shelomoh ben Aderet, in causing a Hebrew translation of this important work to be prepared.—In the Introduction, the author states that he has written a Commentary on the Babylonian Talmud treatise Ḥullin and on nearly three entire sections, viz., Moëd, Nashim, and Nezikin. Of all these Commentaries only the one on Rosh ha-shanah is known.