“If a man would be righteous, let him depart from a court. Virtue is incompatible with absolute power. He who is ashamed to commit cruelty must always fear it.”

Source: 1984

Vice and Virtue, ii
The Note-Books of Samuel Butler (1912), Part II - Elementary Morality

Source: The Jewels of Aptor (1962), Chapter X (p. 133)
Context: A lesson which history should have taught us thousands of years ago was finally driven home. No man can wield absolute power over other men and still retain his own mind. For no matter how good his intentions are when he takes up the power, his alternate reason is that freedom, the freedom of other people and ultimately his own, terrifies him. Only a man afraid of freedom would want this power, who could conceive of wielding it. And that fear of freedom will turn him into a slave of this power.

Christianity and Power Politics (1936)
Context: In the simple and decadent individualism of the Oxford group movement there is no understanding of the fact that the man of power is always to a certain degree an anti-Christ. "All power," said Lord Acton with cynical realism, "corrupts; and absolute power corrupts absolutely." If the man of power were to take a message of absolute honesty and absolute love seriously he would lose his power, or would divest himself of it. This is not to imply that the world can get along without power and that it is not preferable that men of conscience should wield it rather than scoundrels. But if men of power had not only conscience but also something of the gospel's insight into the intricacies of social sin in the world, they would know that they could never extricate themselves completely from the sinfulness of power, even while they were wielding it ostensibly for the common good. (Chapter 29: "Hitler and Buchman")

Source: Night Embrace

"Heidelberg Disputation: Thesis 7" (1518), http://bookofconcord.org/heidelberg.php#7

Acceptance Speech http://www.washingtonpost.com/wp-srv/politics/daily/may98/goldwaterspeech.htm as the Republican Presidential candidate, San Francisco (July 1964)
Unsourced variant: Now those who seek absolute power, even though they seek it to do what they regard as good, are simply demanding the right to enforce their own version of heaven on earth, and let me remind you they are the very ones who always create the most hellish tyranny.
Context: Those who seek absolute power, even though they seek it to do what they regard as good, are simply demanding the right to enforce their own version of heaven on earth. And let me remind you, they are the very ones who always create the most hellish tyrannies. Absolute power does corrupt, and those who seek it must be suspect and must be opposed. Their mistaken course stems from false notions of equality, ladies and gentlemen. Equality, rightly understood, as our founding fathers understood it, leads to liberty and to the emancipation of creative differences. Wrongly understood, as it has been so tragically in our time, it leads first to conformity and then to despotism.

Source: War and Peace

Thoughts and Aphorisms (1913), Bhakti