Pope Leo has said that “The Practice of the Presence of God” by a 17th-century Carmelite friar named Brother Lawrence is a book that helps expain his own spirituality.

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Department of Frontier Materials, Nagoya Institute of Technology, Showa-ku, Nagoya 466-8555, Japan, and Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, ...