Dive into the profound depths of Christian spiritualism with The Mirror of Simple Souls, an early 14th-century work by Marguerite Porete. It's exploration of Oneness with God, though influential at the time of its writing, was denounced by Church authorities as heretical and banned for its supposed connection to Antinomianism. Since it's attribution to Porete in the 1940's, The Mirror of Simple Souls has come to be regarded as among the most important works of medieval Christian mysticism.