The medieval philosophers departed from the non-systematic theology of biblical and rabbinic literature. Philosophers like Maimonides worked tirelessly to make their philosophical interests coincide with the truths of the Bible. They wrote proofs for the existence of God and struggled with passages in the Torah that seem to compromise God's unity. The medieval mystics--or kabbalists--also developed systematic theologies. They posited that God in Himself--known as the Ein Sof, or Infinite--cannot be discussed or described. However, God is revealed in the ten sefirot, divine attributes or powers, and this manifest form of God is intelligible to humankind.
Secularization and the values of the modern world have created challenges for traditional conceptions of the Jewish God. Jewish thinkers adjusted to the rationalistic universalism of early modern philosophy by focusing on the ethical implications of Judaism's belief in one God. Later, existentialists like Martin Buber focused on the experiential relationship between humans and God. Mordecai Kaplan and Richard Rubenstein took the challenges of scientific naturalism and the Holocaust so seriously that they rejected the traditional Jewish God. Finally, feminism raised serious questions about the problems of a male God.
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