... of the same kind in Eckhart's sermons—as good and sensible doctrine as one could find anywhere. But what was the practical effect of his teaching as a whole? It is generally the case that the really weak points of any religious movement are exposed with a cruel logicality most exasperating to the leaders by the second generation of its adherents. The dangerous side of the Eckhartian mysticism is painfully exhibited in the life of his spiritual daughter, "Schwester Katrei," the saint of the later Beguines. ... — Light, Life, and Love • W. R. Inge
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