《太平广记·卷十三·神仙十三》
孔安国是山东人，经常练运气闭气，服用铅炼的丹，活到三百岁面容还像儿童。
孔安国者，鲁人也。常行气服铅丹，年三百岁，色如童子。
Kong Anguo is from Shandong. He often practices luck and closed his breath, takes pills made of lead, and lives to be 300 years old with a face like a child.