One of the most momentous, yet all but invisible, psychological changes in human history has been the intensification of a sense of insecurity and alienation from the world around us that arose when we became no longer able easily to get food in a few hours just by gathering it, or hunting it, but had to organize ourselves in a purposeful fashion simply to survive. This change is undocumented, though occasional clues can be gained about it from the comments of the few still alive who have lived through a version of it, such as old Australian Aboriginals. Its essence is subjection to a pervasive but unacknowledged, indeed unnamed, fear. It is the foundation of civilization.
~ Mark Elvin
