It seems that seraphim (plural of seraph) are angelic beings of one of the higher heavenly orders. They appear to be similar to cherubim and, like cherubim, are heavenly guardians who serve the Almighty. In the only biblical reference to them they have a special concern for holiness and morality (Isaiah 6:1-7; see CHERUBIM).
The "bridge" element in the title reflects the aim of all Bridgeway books, which is to bridge two gaps at once - the gap between the word of the Bible and the world of today, and the gap between the technical reference works and the ordinary reader.Wikipedia
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