'Themselves' in the Bible

“The Chaldeans are dreaded and feared;Their justice and authority originate with themselves and are defined only by their decree.

“Their horses are swifter than leopardsAnd keener than [hungry] wolves in the evening,Their horsemen come galloping,Their horsemen come from far away;They fly like an eagle swooping down to devour.

“Then they will sweep by like the wind and pass on.But they will be held guilty,They [and all men] whose own power and strength is their god.”

“Is it not indeed from the Lord of hostsThat peoples labor [only] for the fire [that will destroy their work],And nations grow weary for nothing [that is, things which have no lasting value]?