“The ancient Greek historian Thucydides observed that there are two opposing human mentalities: the Athenian, always innovating, always venturing out to learn and acquire something new; and the Spartan, staying put in order to defend what he already has.”

From Athens to Sparta: How Trumpism Is Driving America’s Decline
Civilizations commit suicide when they build walls against the outside world
theunpopulist.net