[Second in a series.]
Reason #2: Documentation is good for the soul. Writing things down regularly provides a good occasion to think about your life as you are living it. Plus, later on, you’ve got something fun to look back on. It’s like vacation photographs, if photographs were comprised primarily of words.
Me, I’ve never managed to sustain a diary. I was able to keep a quasi-diaristic blog on my own for a few years and only stopped doing that when it became too conspicuous. Public writing, even if too a very small or even hypothetical public, is easier to keep with, because it’s not just you who knows if you let it go.