“The Spartans sacrificed mobility for safety. They managed to preserve stability for three hundred years, but at what cost? They had no culture beyond warfare, ... While their neighbors took to the sea, learning to adapt to a world of constant motion, the Spartans entombed themselves in their own system.... Only stasis allowed them to survive. But nothing in the world can remain stable forever, and the shell or system you evolve for your protection will someday prove your undoing.” 
― Robert Greene