《太平广记·卷十三·神仙十三》
有个叫陈伯的安乐县人，要求侍奉孔安国，安国就收他为弟子，考察了三年，看他学道的志向坚定，就对他说： 我从小就勤奋刻苦地寻求道术，什么地方都去过了，但仍没有得到 八石登天 的神丹和成仙的方术，只得到了可成地仙的方术，只能不死而已。
有陈伯者，安乐人也。求事安国，安国以为弟子。留三年，知其执信。乃谓之曰： 吾亦少更勤苦，寻求道术，无所不至，遂不能得神丹八石登天之法。唯受地仙之方，适可以不死。
A person from Anle County named Chen Bo asked to serve Kong Anguo, and Anguo accepted him as a disciple. Anguo observed him for three years and saw that he was determined in his ambition to learn Taoism. Anguo then said to him, “I have been diligently and enduringly pursuing Taoism since I was young, and I have been to many different places. But I still have not acquired the divine pellet needed to ascend to heaven on a rock or the magic skills needed to achieve immortality. I have only acquired the magical skill of becoming a terrestrial immortal, which only allows one to live forever.”