In general, the more explaining you do, the more you are justifying your point.....which means you need to convince yourself and others that you are "right", whatever that means The assured person doesn't need to convince others. They believe in what they believe in. If others agree, cool. If not, cool.
What's your take on emotional attachment to arguments? Can you view a viewpoint radically different to yours and respond with 1-2 sentences, and leave it at that?