That night—to some extent, that picture—changed [my friend Rob’s] life. He enrolled in Bible classes at the church, and went on to become a missionary in Africa. The same night sent me in the opposite direction, at least for a time. But would a different painting—Caravaggio’s “Conversion of St. Paul,” for example—have kept me in the pew? We like to think of our beliefs, and disbeliefs, as founded on reason and close, thoughtful observation. Only in theory do we begin to suspect the power of aesthetics to shape our lives.

And what drew me back, some time later, toward the possibility of faith? Poetry. George Herbert and Gerard Manley Hopkins and T. S. Eliot. One night, I was reading the last lines of “Little Gidding” to a friend, my voice thick with emotion, and when I looked up he was staring at me with kindly amusement. “So,” he said. “You really like that stuff?”