The Romans built a wall across Europe, intending for it to go all the way to the Black Sea. It was to mark the frontier of the empire and to keep out the barbarians. Now it is seen only in ruins. The project was so vast and the stones so large some said the wall actually was built by the devil. Well, the devil did not build that wall, but he is in the wall-building business. The devil does build walls to separate us from one another: social walls, economic walls, racial walls.