-Confucious
Language is one of the fundamental operating systems of thoughts. Therefore, if you can change the definition of a word or associate it with its opposite counterpart, you change the fundamental way in which people view the world. I have noticed that in our society words are losing their meaning or having their meanings changed on purpose. If you can delete words, you can remove ideas from peoples heads. It's hard to communicate a concept if you can't find the right words. What if you had never heard of the word Freedom or any of its synonymys? George Orwell captured this concept in his book 1984 when he coined the terms NewSpeak and OldSpeak. NewSpeak is described as, "a language characterized by a continually diminishing vocabulary; complete thoughts reduced to simple terms of simplistic meaning." A modern example would be how text messages have devolved conversations to: "Sup", and, "Not Much, U".
Many powerful words are now used casually thanks to persistent marketing campaigns. Russel Brand captures this well in a comedy skit. He explains how such a deep, passionate, and emotional word like "Love" has been associated with a meaningless disgusting McDonald's burger with the catch phrase, "I'm Lovin' It".
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I could keep rambling and go further in depth, but I think reading 1984 and simply looking at our current world would be a better explanation. Be mindful of your words. Call things the way you see them. Do not sugar coat reality.