You're thinking about something, my dear, and that makes you forget to talk. I...

You're thinking about something, my dear, and that makes you forget to talk. I can't tell you just now what the moral of that is, but I shall remember it in a bit."
"Perhaps it hasn't one," Alice ventured to remark.
"Tut, tut, child!" said the Duchess. "Everything's got a moral, if only you can find it.