“Power tends to corrupt, and absolute power corrupts absolutely,” is the most famous quote by the English Catholic historian Sir John Dalberg-Acton. But what exactly did he mean by it?

That particular es from a letter to Bishop Creighton in which Lord Acton explains that historians should condemn murder, theft, and violence mitted by an individual, the state, or the Church. Here is the context:

I cannot accept your canon that we are to judge Pope and King unlike other men, with a favourable presumption that they did no wrong. If there is any presumption it is the other way, against the holders of power, increasing as the power increases. Historic responsibility has to make up for the want of legal responsibility. Power tends to corrupt, and absolute power corrupts absolutely. s, even when they exercise influence and not authority, still more when you superadd the tendency or the certainty of corruption by authority. There is no worse heresy than that the office sanctifies the holder of it.

Here are the greatest names coupled with the greatest crimes; you would spare those criminals, for some mysterious reason. I would hang them higher than Haman, for reasons of quite obvious justice, still more, still higher for the sake of historical science.

Lord Acton is saying that rather than excuse “great men” because of the burdens placed upon them by their office or authority, we should judge them even more harshly than we would actions of mon man or woman. It’s ironic that Acton had to tell this to a bishop since the Bible has quite a lot to say about abuse of power. Yet even Christian tend to thinkthat we are immune to the temptations of power and that if we were give more authoritywe wouldn’t abuse it.

Haveyou ever imagined what you’d do if you were made ruler of the world (or at least a small country)? Your first inclination is likely to be to use your power as a benign dictator to enact positive reforms that would make everyone better off. So why don’t actual rulers do the same? Why don’t they act in a rationals ways like we would if we had their power?

The main reason, asCGP Grey explains in this clever video, is that no person can rule alone. Because of that, rulers(and powerful people in general) have incentives to use—and abuse—their power in ways that tend to lead to corruption.

(If you find the pace of the videos too slow, I’d mend watching them at 1.5 to 2 times the speed. You can adjust the speed at which the video plays by clicking on “Settings” (the gear symbol) and changing “Speed” from normal to 1.25, 1.5 or 2.)