This sentence comes from "Master Zhuangzi": "When the spring is dry, it is better for fish to get along with the land than for rivers and lakes to forget each other." It is better to forget Yao than to rebel. "After the spring water dried up, the fish stuck to the land together, breathing the moisture in each other's mouths and wetting each other with spittle in their mouths. Even so, it is better to forget each other in the Jianghu. Instead of praising Yao and scolding Jie, it is better to forget both and assimilate into the avenue. It seems that Zhuang Zhou made it very clear. In fact, even if they are on the verge of extinction, the fish that are still together are not more noble and admirable than the fish that can still play in the rivers and lakes despite giving up. Just like the so-called good and bad in the world, there is actually no difference. As long as let nature take its course, or do nothing or do everything, you can get the same result in the same way. In fact, a passage from Confucius can be used as a comment-Confucius said: "Fish makes water and man-made roads. Those who build water together, cross the pool to eat; People who create Tao are born with nothing. "As the saying goes," Fish forget rivers and lakes, while people forget Taoism. " Thus, the meaning of Zhuangzi's so-called "Jianghu forgetting each other" became very clear, which echoed his famous saying: "My life is limited, but my knowledge is also limited. With the limit, it is almost impossible. Almost all the people who did what he did are gone (homogeneous object theory). It's better to forget that the springs in the rivers and lakes dried up and two fish in love stayed on land. They just breathe and get wet with each other, but this kind of life is not as good as forgetting each other in the rivers and lakes.