Reform Judaism (also known as Liberal Judaism or Progressive Judaism) is a major Jewish denomination which emphasizes the evolving nature of the religion, the superiority of its ethical aspects to the ceremonial ones, and a belief in a continuous revelation not centered on the theophany at Mount Sinai. It is characterized by a lesser stress on ritual and personal observance, regarding Jewish religious law as of basically non-binding nature, and great openness to external influences and progressive values. The origins of Reform Judaism lay in 19th-century Germany, where its early principles were formulated by Rabbi Abraham Geiger and his associates. Its greatest center today is in North America.