In my own experience, what I can express in words is quite limited compared to the thoughts, feelings, experiences, sensations, and questions I have.  I do believe that language is limited, to some extent, and that's why we love finding those people who simply "get" us without needing a long explanation.  However, often I find myself talking and talking, yet not saying much.  I have a hard time making my words form complete yet concise sentences, and I know I'm not alone.  I also know that I learn things about myself by writing or speaking - it's like something doesn't seem true or real unless it's somewhere other than in my head - and that's a big part of who we are, I think.