Qhere can I find national apostacy will bring national ruien?
The phrase "national apostasy will bring national ruin" does not appear verbatim in Ellen G. White's published books, but the concept is clearly expressed in her writings. The closest and most direct statement is found in The Spirit of Prophecy, Volume 4, page 410, paragraph 2: "When Protestant churches shall seek the support of the secular power, thus following the example of that apostate church, for opposing which their ancestors endured the fiercest persecution, then will there be a national apostasy which will end only in national ruin." (4SP 410.2) This passage is the clearest source for the idea that national apostasy will result in national ruin. Academic Reference: White, E. G. (1884). The Spirit of Prophecy, Volume 4, p. 410, paragraph 2.
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