The Book of Rites: "Its actions are based on its own principles, advancing with each other, retreating with differences, and making friends like this." "The Biography of Zhong Changtong in the Later Han Dynasty": "After more than 2 years, I have traveled among the youth, Xu, He and Ji, and I am different from my friends." Qing Nalan Xingde's Miscellaneous Knowledge of Lushui Pavilion, Volume II: "If you can't trust friends, you will be unfaithful.