Coined by British historian Lord Acton in an 1887 letter, the full quote is "Power tends to corrupt, and absolute power corrupts absolutely." It means that when people gain unchecked authority, their morality fades as they start abusing their position for self-gain. [1, 2, 3]

Core Meaning
Loss of empathy: High authority blinds leaders to the needs of regular people.
Removal of limits: Without rules, self-interest replaces ethical choices.
Human vulnerability: Anyone given total control eventually yields to corruption. [1, 2]


Historical Origin
Letter to a Bishop: Acton wrote this to Bishop Mandell Creighton while discussing moral standards in historical figures.
The Full Quote: Acton added that great men are almost always bad men.
Earlier Thinkers: Writers like William Pitt the Elder and Montesquieu shared similar ideas before 1887. [1, 2]


Prevention and Systems
Checks and balances: Democracies divide power to stop total control.
Rule of law: Equal rules keep leaders accountable to citizens. [1, 2]