Maimonides simplified the Talmudical rules and traditions, making them clear to the comprehension of all. He was the author of an exhaustive work, entitled, Mislme Torah, the " Second Law, which was eagerly copied and extensively disseminated. He also wrote many philosophical treatises leveled against atheism, and designed to prove that God produced the world from naught, and at the age of fifty gave to the world his great work, Moreh Nebuchim ( " Guide of the Perplexed *), to which Rabbi Judah Charizi added an appendix.