“It might seem singular that Nancy—with her religious theory pieced together out of narrow social traditions, fragments of church doctrine imperfectly understood, and girlish reasonings on her small experience—should have arrived by herself at a way of thinking so nearly akin to that of many devout people, whose beliefs are held in the shape of a system quite remote from her knowledge—singular, if we did not know that human beliefs, like all other natural growths, elude the barriers of system.”