This is all about finding peace and losing 'ego.' Sometimes, I have no trouble doing this -- I can hold my tongue and simply let others espouse their ideas (ie, with politics). Other times, if it's a subject where I feel I have something valuable to add, it's hard for me to keep quiet...but the few times I've tried it, I've noticed that, in all honesty, my opinion truly didn't matter that much.
It's something I strive for more and more, I must admit. What do you think? (Ha, ironic on a post like this, no, that I'm asking for your opinion? :D)