To be expressed I can do for and with myself. I can write so that I understand my thinking, the way I feel today, or felt in the past - even if that is not now. I may write to my future self, in the hope that she might understand me. Not hope exactly "in wonder" perhaps.
Perhaps.
I can of course be expressed when I communicate succesfully in text, or on stage. When I am understood. But that understanding might not be now, and it can be never.
I can be expressed when I publish, and I am read. When I receive the recognition that I have said something - though of course I can also publish and have said nothing. I could simply entertain, or document.
To be expressed is to do something motivated. It is to try to change someones mind. Even if that is only my own. It has intent. Passion. It is in some sense alive.
Perhaps.