Sometimes I have an opinion that I just can't find the words to express.
Sometimes I have things I want to share that I have trouble putting together coherently.
Sometimes I think things that I don't believe will be popular, and I don't want to talk about them if I can't speak (or write) eloquently and concisely.
Sometimes I struggle with issues, and my thinking becomes circular. My writing then becomes unreadable.
Sometimes I have things I want to talk about, but don't feel I should. Then the things I want to talk about choke out the things I can talk about.
Sometimes I just have to take a breath.