The proud feeling of self-sufficiency, the obsession for exclusiveness and separation--so distinctively a Jewish trait at that time--was inculcated at the maternal knee and emphasized in synagog and school. The Talmud,[165] which in codified form post-dates the time of Christ's ministry, enjoined all Jews against reading the books of alien nations, declaring that none who so offended could consistently hope for Jehovah's favor.[166] Josephus gives his endorsement to similar injunction, and records that wisdom among the Jews meant only familiarity with the law and ability to discourse thereon.[167] A thorough acquaintanceship with the law was demanded as strongly as other studies were discountenanced. Thus the lines between learned and unlearned came to be rigidly drawn; and, as an inevitable consequence those who were accounted learned, or so considered themselves, looked down upon their unscholarly fellows as a class distinct and inferior.[168] Long before the birth of Christ, the Jews had ceased to be a united people even in matters of the law, though the law was their chief reliance as a means of maintaining national solidarity. As early as four score years after the return from the Babylonian exile, and we know not with accuracy how much earlier, there had come to be recognized, as men having authority, certain scholars afterward known as scribes, and honored as rabbis[169] or teachers. In the days of Ezra and Nehemiah these specialists in the law constituted a titled class, to whom deference and honor were paid. Ezra is designated "the priest, the scribe, even a scribe of the words of the commandments of the Lord, and of his statutes to Israel".[170] The scribes of those days did valuable service under Ezra, and later under Nehemiah, in compiling the sacred writings then extant; and in Jewish usage those appointed as guardians and expounders of the law came to be known as members of the Great Synagog, or Great Assembly, concerning which we have little information through canonical channels. According to Talmudic record, the organization consisted of one hundred and twenty eminent scholars. The scope of their labors, according to the admonition traditionally perpetuated by themselves, is thus expressed: _Be careful in judgment; set up many scholars, and make a hedge about the law_. They followed this behest by much study and careful consideration of all traditional details in administration; by multiplying scribes and rabbis unto themselves; and, as some of them interpreted the requirement of setting up many scholars, by writing many books and tractates; moreover, they made a fence or hedge about the law by adding numerous rules, which prescribed with great exactness the officially established proprieties for every occasion.