People do not always tell the truth because they aren't aware of their assumptions, they are uncomfortable revealing their thoughts, or can't clearly articulate how they see things. You can help them understand and move forward by noticing and sharing their non-verbal emotional shifts. Here's how.
Convincing and influencing are different; one has a negative outcome, the other positive. To change minds you must influence their thinking by doing these 4 things.
Mastery is the deepening of presence, not the perfection of skills. You must learn how to clear your mind and use emotions to achieve "full-body" presence to master any sport, performing art, or profession.