Got some enlightening points from this book "Effective Communication, The Most Important Management Skill Of All", by John Adair.(1) The author mentioned that non-verbal communication is a natural or unconscious expression of our feelings and "one can only change non-verbal behaviour by changing the inner nature that it is expressing."
(2) John also defined what he calls the "Bore" in communication as "one who insists on monopolizing the conversation to transmit their messages, regardless of the needs or interests of their hearers". He emphasizes our lack of awareness of the importance of dialogue, "listening as well as speaking, of sharing instead of giving."
(3) "Communication creates relationships, relationships produce communication."
The book has 3 parts and I'm just at Part I, but I wanted to note down my learnings.