《列子·黄帝》
子夏说： 以我从孔子那里听来的话说，得中和之气的人，身心同外物融合在一起，因而万物不能伤害与阻碍他，在金石中游玩，在水火中行走，都是可以的。 
子夏曰： 以商所闻夫子之言，和者大同于物，物无得伤阂者。游金石，蹈水火，皆可也。 
Zixia said: According to what I heard from Confucius, a person who has obtained the moderate and harmonious energy will have his body and mind integrated with external objects, so that all things cannot harm or obstruct him. He can play around in gold and stones, and walk through water and fire. 