Which sentence from Nathaniel Hawthorne's short story "Dr. Heidegger's Experiment" suggests that Dr. Heidegger's character represents wisdom and reason? "My poor Sylvia's rose!" ejaculated Dr. Heidegger, holding it in the light of the sunset clouds; "it appears to be fading again." "I love it as well thus, as in its dewy freshness," observed he, pressing the withered rose to his withered lips. "Yes, friends, ye are old again," said Dr. Heidegger, "and lo! the Water of Youth is all lavished on the ground." "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."