People the world over believe that stress comes from external sources.
One complains of a nagging wife or hysterical husband. Another finds fault with the demands of work or the exploitation of management. Someone else grumbles at summer being too hot or winter being too cold.
Everyone thus lives with the belief that factors outside themselves produce stress -- so their entire focus is on correcting the external world. Yet despite our best efforts to fix these external factors, the problems remain unsolved and our minds continue to be consumed by stress.