Have you ever met up with a friend after a long time? In the first rush of conversation, you can encapsulate years in just a couple of sentences - and then be left with little to say.
Bit like blogging... not having written for a while, I could say, work is busy, I've started the sword form in tai chi, and then be stuck for words. But writing my Soul Journal every night, I can cover pages with my thoughts and even small events assume their own importance.