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그들이 통곡할 때에 너를 위하여 애가를 불러 조상하는 말씀이여 두로 같이 바다 가운데서 적막한 자 누구인고
When 'islands' are contrasted to 'earth' or 'mountains,' they signify the truths of faith, because they are in the sea. They signify doctrinal things which are rituals. 'Islands' signify peoples who are more remote from the worship of God. People who are steeped in the internal sense of the Word, such as angels, do not know what islands are, because they no longer have any concept of such places. Instead they have a perception of more remote worship, like the gentiles outside the church.
'Islands,' in Ezekiel 27:6, signify people in the church in a natural, materially-oriented state but still rational.
(Reference: Apocalypse Explained 406; Isaiah 1, Isaiah 49, 49:1)