The basic tool for the manipulation of reality is the manipulation of words. If you can control the meaning of words, you can control the people who must use the words.
Source: I Hope I Shall Arrive Soon, Introduction, How to Build a Universe That Doesn't Fall Apart Two Days Later (1986).
-- Philip K Dick, (Dec 16 1928-1982), US science fiction writer; He is a science fiction author who won the 1962 Hugo award for Man in the High Castle.