《论衡·卷七·道虚篇》
文挚能被煮三天三夜，颜色一点不变，却因为一盖上盖子的缘故，就断气而死，这就是没有得道的证明。
夫文挚而烹三日三夜，颜色不变，为一覆之故绝气而死，非得道之验也。
Wen Zhi was able to be boiled for three days and three nights, with no change in complexion. However, when he put on a lid, he suffocated to death. This is because he had not attained the enlightenment.