All writing has an audience. That’s the point. Without a potential audience what you are doing is a pointless and fruitless exercise. Writing out your thoughts allows you to put them in a coherent order and reassess whether or not it says what you want it to say, and also whether or not it’s appropriate for the audience. Writing allows something as transient as a thought to be solidified into something that can exist and be passed on to others long after the original thought occurred. And writing allows a thought from a century ago influence a new thought which will influence other thoughts.