Xu Gong didn't give it to others for nothing, but what he saw at first sight. How to explain it?

Description: Mr Xu, I don't associate with people easily. One day, I suddenly met him. At first glance, it looks like an old friend.

The words in Historical Records, Biography of Zhang Er and Chen Yu: "Please ask the public. (Zhang Er) looked up and he said, "Revenge evil!" Unloading everyone's hard work is like a lifetime of embarrassment, and I asked Zhang if he had any plans. "Han Zhang Er Chen Yuchuan" as "Ping Sheng Huan". Song Zhang Hao's Miscellaneous Notes on Xu Gong Tie, Assistant Minister of Yungu: "Xu Gong does not give to others in vain. One day, if he gives it suddenly, he will find peace and happiness." Dai's "Tao Anmeng Memories Shu Paintings": "Uncle Jian has no face to see. When he visited, he regarded him as a peaceful life, so he stayed on the couch. "