and harmonize Greek philosophy with Jewish philosophy. His work attempts to combine Plato and Moses into one philosophical system. He developed an allegoric approach of interpreting holy scriptures (the bible), in contrast to (old-fashioned) literally interpretation approaches. His allegorical exegesis was important for several Christian Church Fathers and some scholars hold that his concept of the Logos as God's creative principle influenced early Christology. Other scholars, however, deny direct influence but say both Philo and Early Christianity borrow from a common source. Between the Ancient era and the Middle Ages most of the Jewish philosophy concentrated around the Rabbinic literature that is expressed in the Talmud and Midrash. In the 9th century Saadia Gaon wrote the text Emunoth ve-Deoth which is the first systematic presentation and philosophic foundation of the dogmas of Judaism. The Golden age of Jewish culture in Spain included many influential Jewish philosophers such as Moses ibn Ezra, Abraham ibn Ezra, Solomon ibn Gabirol, Yehuda Halevi, Isaac Abravanel, Nahmanides, Joseph Albo, Abraham ibn Daud, Nissim of Gerona, Bahya ibn Paquda, Abraham bar Hiyya, Joseph ibn Tzaddik, Hasdai Crescas and Isaac ben Moses Arama. The most notable is Maimonides who is considered, beside the Jewish world, to be a prominent philosopher and polymath in the Islamic and Western worlds. Outside of Spain, other philosophers are Natan'el al-Fayyumi, Elia del Medigo, Jedaiah ben Abraham Bedersi and Gersonides. Philosophy by Jews in Modern era was expressed by philosophers, mainly in Europe, such as Baruch Spinoza founder of Spinozism, whose work included modern Rationalism and Biblical criticism and laying the groundwork for the 18th-century Enlightenment. His work has earned him recognition as one of Western philosophy's most important thinkers; Others are Isaac Orobio de Castro, Tzvi Ashkenazi, David Nieto, Isaac Cardoso, Jacob Abendana, Uriel da Costa, Francisco Sanches and Moses Almosnino. A new era began in the 18th century with the thought of Moses Mendelssohn. Mendelssohn has been described as the "'third Moses,' with whom begins a new era in Judaism," just as new eras began with Moses the prophet and with Moses Maimonides. Mendelssohn was a German Jewish philosopher to whose ideas the renaissance of European Jews, Haskalah (the Jewish Enlightenment) is indebted. He has been referred to as the father of Reform Judaism, though Reform spokesmen have been "resistant to claim him as their spiritual father". Mendelssohn came to be regarded as a leading cultural figure of his time