There is a passage in Historical Records of Laozi's Biography of Han Fei, which is Confucius' evaluation of Laozi. The original text is "Confucius, saying that his disciple said,' Birds, I know they can fly; Fish, I know it can swim; Beast, I know it can walk. Walking can be Wang ⑦, swimming can be Lun ⑧ and flying can be Li ⑨. As for dragon five, I don't know. He took advantage of the storm to go to heaven. I saw Lao Tzu today, and he is still evil! " "
However, "knowledge is unfathomable and interest is elusive; I'm afraid there is no such thing as "bend like a snake and become like a dragon"