So, I find myself buttering a piece of toast, not thinking about anything in particular, and I suddenly wonder, "Why am I doing this?" Sometimes it happens this way -- I operate on autopilot while I'm thinking about something undoubtedly profound, and I find I have undertaken a complex enterprise like fixing a snack without thinking about it at all. "I was hungry" comes an internal reply. Well, indeed, that is a sufficient response -- hunger drove me to action, no explanation needed, no premeditation required, Hunger, and the action to alleviate it, just appeared without any will or other motivating force. Survival of the body has its own imperatives.
Well, now in the same vein I suddenly wonder, "Why am I typing this?" Certainly not as cleanly justified as buttering toast, but the words appear almost of their own volition. I don't really have anything to say, I'm just a happy little automaton exercising my sentence-making facility.
Spinning words until something interesting appears. Sometimes that happens. Sometimes it doesn't.