The fable in the story is: "An old house is like a candle, slowly burning itself and illuminating others."

The old house that will never fall down is a fairy tale. "Old houses are like candles. They burn slowly and illuminate others." This sentence compares the old house to a candle, which means that although the old house is very old, it is still providing help and support to people, just like a candle, burning itself and illuminating others.

This metaphor expresses the selfless dedication and perseverance of the old house, and also makes people cherish and care for the old house more.