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.

Chapter X (p. 133) - The Jewels of Aptor (1962)