In 1960, six-year-old Ruby Bridges was the first African-American child to integrate an all-white public elementary school in the American South. Every day for months, federal marshals escorted Ruby past a mob of angry parents shouting curses, threats and insults at her. Safely inside, she sat in a classroom alone with Barbara Henry, the only teacher willing to instruct her while parents kept their children from attending school with Ruby.

Noted child psychologist Robert Coles met with Ruby for several months to help her cope with the fear and stress she experienced. He was amazed by the prayer Ruby said every…