But behavior in the human being is sometimes a defense a way of concealing motives and thoughts as language can be a way of hiding your thoughts and preventing communication.
Trust is the glue of life. It's the most essential ingredient in effective communication. It's the foundational principle that holds all relationships.
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I think we have to face the reality that in a society where there is a legitimate threat of terrorism not being able to see one's face not being able to have some sense of communication in that way is for many societies a challenge.