In this passage Dr. Heidegger scolds his friends for not having used the lessons they learned in aging to prevent them from being foolish once they regained their youth. While Heidegger's observations of the four are accurate, the passage leads the reader to wonder what shortcomings beset Heidgger when he was young.
"Yes, friends, ye are old again," said Dr. Heidegger, "and lo! the Water of Youth is all lavished on the ground. Well--I bemoan it not; for if the fountain gushed at my very doorstep, I would not stoop to bathe my lips in it--no, though its delirium were for years instead of moments. Such is the lesson ye have taught me!"