Early Christian Quotes on the Age of the Earth
Theophilus of Antioch’s Book 3 (Late 2nd Century) Chapter 28:
And from the foundation of the world the whole time is thus traced, so far as its main epochs are concerned. From the creation of the world to the deluge were 2242 years. And from the deluge to the time when Abraham our forefather begat a son, 1036 years. And from Isaac, Abraham's son, to the time when the people dwelt with Moses in the desert, 660 years. And from the death of Moses and the rule of Joshua the son of Nun, to the death of the patriarch David, 498 years. And from the death of David and the reign of Solomon to the sojourning of the people in the land of Babylon, 518 years 6 months 10 days. And from the government of Cyrus to the death of the Emperor Aurelius Verus, 744 years. All the years from the creation of the world amount to a total of 5698 years, and the odd months and days.
Origen’s De Principiis (Early to Mid-3rd Century) Book 3, Chapter 5, Paragraph 3:
[Some may ask,] "If the world had its beginning in time, what was God doing before the world began? For it is at once impious and absurd to say that the nature of God is inactive and immoveable, or to suppose that goodness at one time did not do good, and omnipotence at one time did not exercise its power."…this world had its beginning at a certain time, and that, agreeably to our belief in Scripture, we can calculate the years of its past duration…we say that not then for the first time did God begin to work when He made this visible world; but as, after its destruction, there will be another world, so also we believe that others existed before the present came into being.
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Find more of what the early Christians thought on my Christian History page!