"Many people believe that self-confidence means standing behind your beliefs 100% ... if you fail to listen to what else is going on in the world and only rely on what you think you know and believe, you've attached yourself to an idea that blinds.  This is not confidence; it is stubbornness.  We are conditioned to believe in such a way that whenever we encounter a truth that contradicts something we believe, we are quick to either reject it or create a story that protects our belief and further weaves a web of distortion.  In so doing, we keep distorting our faith further, forming new beliefs to keep our sense of self safe."

From The Five Levels of Attachment