wisdom of the young and old

i tried to teach kezia wisdom last week but forgot to mention it. the conversation happened at the dinner table:
jane: “kezia, what would you like for your pudding?”
kezia: “yoghurt please mummy”
jane: “you had yoghurt for your dinner so you can’t have one for your tea i’m afraid”
kezia: “oh. in that case i’ve changed my mind. i DON’T want yoghurt for my dinner. So can i have it now instead ?”.
me (spotting my moment): “you can LEARN from the past, but you can’t CHANGE it”
everyone: stunned silence.
RESULT: kezia had an apple