Behind the cast-iron grilles and beautiful, solemn, reverent chapels of Carmelite cloisters all over the world lies a mystery — a mystery of divine faith, ardent love and unfailing hope. “When I was 12 years old, I read a children’s book on the life of St. Thérèse of Lisieux and I was so taken by her passionate love for Jesus and how she gave herself to him in Carmel at such a young age,” says a young solemn-professed nun from Pleasant Mount Carmel in the Diocese of Scranton…