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In other words, the book of Revelation is designed to show that the whole world shall be lighted by the churches, which are the light-bearers reflecting the original light of their Lord in heaven; that this worldwide illumination shall be in the Spirit's dispensation and through the gospel. The theme, then, of Revelation – God help me to impress it upon you, for your reception or rejection of it will make you a pessimist or an optimist – the theme of this book is) the evangelization of this world, the salvation of every man to be saved in. this world, to be brought about by the means of Christ shining, not personally but as reflected in the candlesticks, or the churches; that all the kingdoms of this world shall be brought into subjection to Jesus Christ through the very gospel you. are preaching now, and not by miraculous powers attending the final advent. It does not mean that the world will become worse and worse and worse, and that the gospel will fail and that the Spirit will fail, and that all the original instrumentalities of salvation will play out, leaving salvation to be accomplished by the final advent. Revelation does not signify that at all.
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B.H. Carroll (An Interpretation of the English Bible: Revelation (Volume XVII))