Revival of the Hebrew language well-recognized sources, chiefly the Tanakh (especially those portions used liturgically like the Torah, Haftarot, Megilot, and the Book of Psalms) and the Mishnah. Apart from these, Hebrew was known through hymns, prayers, midrashim, and the like. During the Middle Ages, Hebrew continued in use as a written language in Rabbinical literature, including in judgments of Halakha, Responsa, and books of meditation. In most cases, certainly in the base of Hebrew's revival, 18th- and 19th-century Europe, the use of Hebrew was not at all natural, but heavy in flowery language and quotations, non-grammatical forms, and mixing-in of other languages, especially Aramaic.
Revival of the Hebrew language many difficulties: parents were opposed to their children learning in an impractical language, useless in higher education; the four-year schools for farmers' children were not of a high caliber; and a great lack of linguistic means for teaching Hebrew plus the lack of words to describe day-to-day activities, not to mention the absence of Hebrew schoolbooks. Added to these, there was no agreement on which accent to use, as some teachers taught Ashkenazi Hebrew while others taught Sephardi Hebrew. In 1889, Ben-Yehuda, together with rabbis Yaakov Meir and Chaim Hirschensohn and educator Chaim Kalmi, founded the Clear Language Society, with