Learning to keep my mouth shut

I've decided to do a study on the mouth. I have discovered that I have serious issues holding my tongue. I always say things at the wrong time or, more often, say things too harshly because I don't think before I speak...I just say what I feel without stopping to think if that was appropriate or necessary to say. I hate knowing, as well, that some incident could have been taken care of if I would have carefully chosen a different tone of voice and watched how I said it. I also like to argue. Well I hate arguing but I do it because I want to be right. Again, it's a pride issue. But the Lord is really trying to teach me something about it because lately I have been in situations where, as much as I want to argue my case and make a point and make someone else feel as bad as they just made me feel or give my opinion, I have got to learn to keep my mouth shut. So I decided to go through my concordance and write down all the relevant references on the mouth. I'm going to, along with the rest of my Bible reading, go over a verse or two each morning and try to memorize it and do my best to apply it through out the day. It's only been a couple days but I have already been able to apply it. I will tell you this, it takes some humbling. You have to swallow your pride in order to keep your mouth shut. But I feel closer to the Lord already. It's really cool to be close enough to the Lord right now to be able to say a silent prayer in my mind whenever I talk to someone and ask Him to guard my mouth and give me wisdom in what I say and how I say it. And He Does!! And so many fights and bad moods are avoided and I feel good cuz I know I'm doing the right thing.
If this is not an area you struggle with, I encourage you to find some area in your life that could use some work and just do a study on it and memorize scripture about it and ask the Lord to help you specifically in each situation where you are faced with it. It could be in the area of worrying, gossiping, lusting, thinking bad or mean thoughts about someone, pride etc.... God promises to take a step toward us if we first take a step toward Him: "Draw nigh to God and he will draw nigh to you." (side note- I don't have my Bible in front of me or one handy so I don't know for sure if that's quoted exactly right or where the reference is).
"Lord, make my words as sweet as honey, for tomorrow I may have to eat them!" --Anonymous
"Help me guard my lips, O Saviour, Keep me sweet when sorely tried, Answers soft to others giving, Meekly swallowing my pride." --Basch
"Among my most prized possessions are words that I have never spoken." --Orson Scott Card
"The difference between the almost right word and the right word is really a large matter -- 'tis the difference between the lightning bug and the lightning." --Mark Twain