《太平广记·卷二十二·神仙二十二》
唐玄宗按照要求去做，一年多以后，神情飘逸，精气旺成，年龄更高了，精力却不减。
玄宗行之逾年，而神逸气旺，春秋愈高，而精力不惫。
Tang Xuanzong did as he was told. More than a year later, his spirits were calm, his energy was vigorous, and he was getting older, but his energy was not reduced.