What is the secret of Qin Qing's persuasion art in Xue Tan's obituary?

Qin Qing's superb skills left a deep impression on Xue Tan. In Xuetan Xuegu, Qin Qing didn't speak, but moved Qin Qing with his own actions, that is, his superb performance skills, so as to convince others. The Biography of Xue Tan is from Liezi Tang Wen, which tells us that there is no end to learning and we should not be complacent. We should learn with an open mind and pursue learning more and asking more questions.