“Consider this: when you’re trying to change someone’s feelings or attitudes, your words account for just 7 percent of your overall message. Seven percent. That’s it. In contrast, your tone of voice accounts for 38 percent of it, and your body language accounts for a colossal 55 percent. This is the famous 7-38-55 rule, or concept, which Albert Mehrabian, a professor emeritus of psychology at the University of California, came up with in 1971 in his book Silent Messages.”