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The Philadelphian Society was a 17th-century group of Christian mystics who believed in the "Philadelphia" state of the church—one defined by brotherly love and spiritual purity—as described in the Book of Revelation.
Together with,
Isaiah 48:20. Go forth from Babylon, flee from the Chaldeans; with a voice of singing declare this, tell it, utter it even to the end of the earth.
In this context, "Babylon" and the "Chaldeans" are used metaphorically to represent spiritual confusion, worldly corruption, or formalist religious institutions that the author believes the faithful should leave.
Printed and Sold by B. Whitlock in Stationers Street, near Grub Street, 1696.