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Author Thomas has created six brief biographies of "20th century mystics," with the emphasis on their spiritual practices.

Included are Rufus Jones, a Quaker and a professor of philosophy; Albert Schweitzer, theologian, philosopher, physician and medical missionary; Glenn Clark, professor of literature, athletic coach and author of books on prayer; Peter Marshall, Presbyterian minister and twice chaplain of the U.S.

Senate; Frank C. Laubach, a Congregational Christian missionary who developed a literacy program that has taught more than 60 million people to read in their own language; and Dietrich Bonhoeffer, a German Lutheran pastor who was executed by the Nazis in 1946 for his anti-Nazi activism, including participating in a plot to assassinate Hitler.

What I had hoped to find was a clearcut definition of a mystic, but instead I found