Major 20th century writers who sought to draw together the active and contemplative poles of Christian spirituality have been Dorothy Day, Thomas Merton and Richard Rohr.
Numerous other authors, including Helen Palmer, Don Richard Riso, Richard Rohr and Elizabeth Wagele, also began publishing widely read books on the Enneagram of Personality in the 1980s and 1990s.
Others to acknowledge Otto were, for instance, Karl Barth, Martin Heidegger, Leo Strauss, John A. Sanford, Richard Rohr, Hans-Georg Gadamer (critical in his youth, respectful in his old age), Max Scheler, Ernst Jünger, Joseph Needham and Hans Jonas.
According to the Christian teaching of Father Richard Rohr, the concept of the third eye is a metaphor for non-dualistic thinking; the way the mystics see.
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