A person who knows all the answers, has an opinion on everything, has a certainty backed up by rational argument, has very little possibility of further progress. Such a person is unlikely to walk away from a discussion with anything more than a reaffirmation of how right he or she has been all along.
We are a feelingless people. If we could really feel, the pain would be so great that we would stop all the suffering. If we could feel that one person every six seconds dies of starvation. . . we would stop it. . . . If we could really feel it in the bowels, the groin, in the throat, in the breast, we would go into the streets and stop the war, stop slavery, stop the prisons, stop the killing, stop destruction.
Not that I feel like I have a lack of confidence, it's just good to stand up in front of people who don't really know what to expect. Am I going to say something? Am I going to sing? And often when I do say anything it gets a laugh, because everyone's already used to laughing. So I can seem like I'm actually a funny person.