Body Language Magic
Many people think that the most popular way of communicating with other people is through the mouth. But what they didn't know is that actual verbal communication accounts to only around 10% (or even less) of the overall means to convey a message.
Moreover, you can never determine the truthfulness or sincerity of people by what they say alone. In fact, words transmitted verbally oftentimes do not reflect what people really think or feel. The only way you can determine their true inner feelings and thoughts is by reading their body language.