1 correspond to seven millennia of the existence of natural creation. The tradition teaches that the seventh day of the week, Shabbat or the day of rest, corresponds to the seventh millennium (Hebrew years 6000–7000), the age of universal "rest" – the Messianic Era. The Talmud comments: The Midrash comments: The Zohar explains: Elaborating on this theme are numerous early and late Jewish scholars, including the Ramban, Isaac Abrabanel, Abraham Ibn Ezra, Rabbeinu Bachya, the Vilna Gaon, the Lubavitcher Rebbe, the Ramchal, Aryeh Kaplan, and Rebbetzin Esther Jungreis. Theory The idea that each age lasts 1000 years is based on II Peter 3:8: "But of this one thing be not ignorant, my beloved, that one day with the Lord is as a thousand years, and a thousand years as one day." The interpretation was taken to mean that mankind would live through six 1,000 year periods (or "days"), with the seventh being eternity in heaven or according to the Nicene Creed, a World to Come. Medieval Christian scholars believed it was possible to determine the overall time of human history, starting with Adam, by counting forward how long each generation had lived up to the time of Jesus, based on the ages recorded in the Bible. While the exact age of the earth was a matter of biblical interpretive debate, it was generally agreed man was somewhere in the last and final thousand years, the Sixth Age, and the final Seventh Age could happen at any time. The world was seen as an old place, with more time in its past than its future. While Augustine was the first to write of the Six Ages, early Christians prior to Augustine found no end of evidence in the Jewish traditions of the Old Testament, and initially set the date for the End of the World at the year 500. Hippolytus said that the measurements of the Ark of the Covenant added up to five and one-half cubits, meaning five and a half thousand years. Since Jesus had been born in the "sixth hour", or halfway through a day (or, five hundred years into an Age), and since five kingdoms (five thousand years) had already fallen according to Revelation, plus the half day of Jesus (the body of Jesus replacing the Ark of the Jews), it meant that five-thousand five-hundred years had already passed when Jesus was born and another 500 years