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The best, most detailed Catholic commentary on St. John's Apocalypse is
cf. the briefer, older commentary: The Apocalypse of St. John (1921) by Fr. E. Sylvester Berry
The woman of chapter twelve is not the Blessed Virgin Mary.
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According to the ancient Fathers, the human nature or character of the Church is here delineated, while in chapters four and five her divine nature and prerogatives were depicted.
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The twelve stars represent the twelve apostles; or they may be God's mystical number symbolizing the Christian nations, that as a contrast to the ten crowned horns of the beast, shall be the glory of the Church when the days of Antichrist approach.
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The moon under her feet has ever been understood to symbolize the unchanging and unchangeable character of the Church.
cf. these excerpts of his commentary on Apoc. 12