I found a great little quote for you this morning. I hope you like it as much as I do:
If someone is able to show me that what I think or do is not right, I will happily change, for I seek the truth, by which no one was ever truly harmed. It is the person who continues in his self-deception and ignorance who is harmed. – Marcus Aurelius, Meditations
I suppose the trouble with always thinking you are right is that it eventually creates a varnish over your heart and mind that is impermeable to truth. That varnish gives the illusion of righteousness and a false sense of protection, when in fact all it does is preserve opinion.