 Subsequent developments of Jewish history in Eastern Europe, particularly the perceived external secularising threats of Haskalah, assimilation, and late 19th century Jewish political movements like Zionism, added additional political and social views to their theologies, drawn from general Talmudic Judaism, in common reaction with their original traditionalist Rabbinic opponents, the Mitnagdim.However, the Hasidic movement can be divided into major groups and schools in its internal spirituality relationship to Hasidic Jewish mystical thought.The first two works of Hasidic thought published ("Toldot Yaakov Yosef" (1780), by Jacob Joseph of Polnoye, and "Magid Devarav L'Yaakov" (1781), by Dov Ber of Mezeritch, compiled by Shlomo of Lutzk) represent the foundational thought of the Baal Shem Tov, and his successor the Maggid of Mezeritch, who lived before Hasidism became a mass movement.