ATHENS and Sparta were both Greek cities and their people spoke a common language. In every other respect they were different. Athens rose high from the plain. It was a city exposed to the fresh breezes from the sea, willing to look at the world with the eyes of a happy child. Sparta, on the other hand, was built at the bottom of a deep valley, and used the surrounding mountains as a barrier against foreign thought. Athens was a city of busy trade. Sparta was an armed camp where people were soldiers for the sake of being soldiers.