My Ever growing mouth!

I can be quiet, I chose not to, but I can.  Really! I know it is hard to believe.  So what I have noticed lately is that I choose to talk at every opportunity given.  Sometimes appropriate but not always.  I recently finished a bible study that had quite a few mature christians and in that class there were only about 3 that participated regularly in the discussion.   This made me wonder why these mature christians were not talking.  Were the mature enough to keep their mouths shut? or did they not have an answer or were they afraid of offending someone else?  I do not know but maybe I should learn to shut my mouth once in a while.  I don't always join the conversation but when talking about religion or spiritually matters I do always join in.  It is the one subject I always have an opinion on and the subject that I truly enjoy talking about, even when others disagree with me.  I will try to be quiet long enough to let someone else answer but I just can't stop talking about this.  Sorry!