Theologia Germanica (14th century)
This work was discovered and published in 1516 by Martin Luther, who said of it that "Next to the Bible and St. Augustine, no book has ever come into my hands from which I have learnt more of God and Christ, and man and all things that are." It has since appealed to Christians of all persuasions. It may have been written by Meister Eckhart.
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