“People say that knowledge is power. The more knowledge, the more power. Which makes you just about the most powerful person on earth. When it comes to killing people. And then getting away with it.”
Source: Running Blind (2000), Ch. 1.
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Lee Child 57
British thriller writer 1954Related quotes

“…possessed of more self-knowledge, which is the kind of knowledge that makes people attractive.”
...sabe más de sí misma, que es el conocimiento que hace atractivas a las personas.
Source: Todas las Almas [All Souls] (1989), p. 68

On achieving the position of leader of Scientology — .

“Knowledge is power; knowledge shared is power lost.”
This has been attributed to Crowley on the internet, but without citation. No incidents of it in Crowley's works have as yet been located.
This was quoted as an "occult tradition" in Fundamentals of Experimental Psychology (1976) by Charles Lawrence Sheridan, p. 17, but without any reference to Crowley.
Disputed
Variant: Knowledge is power and knowledge shared is power lost.