"Height determines eyesight" is almost a truth. Because people's understanding is often difficult to transcend their own historical conditions and interests. For example, our ancestors could not have foreseen modern technology, nor did they expect to see the "emperor" without kneeling. However, as the spirit of all things, human beings do not "live long" after all. Some people have extraordinary judgment and foresight, which is confirmed by later social practice.
It is also a truth that "the angle changes the attitude". Because for the same thing, people will come to different conclusions from different angles, and the conclusions will even be completely opposite because of the relationship of interests. Although the truth is well known, it will be very difficult to change it. If we must change, we must strive to jump out of the interests of individuals and small groups, "worry about the world first, and enjoy the world later." Only in this way can we "make the world public". "People not only kiss their relatives, but also have only children, so that they can be supported in the old age, be useful to the strong, be good at their young age and be lonely." The Book of Rites, of course, has been a beautiful and unattainable wish of China people for thousands of years.
"Grasp life by scale" is a famous saying. In the modern life where people's knowledge level is generally improved and information dissemination is unimpeded, people can clearly define good and evil, beauty and ugliness, right and wrong, merits and demerits, and operational norms. The problem is how to grasp the best scale among many things, which is worth people's lifelong exploration. For example, it is obviously against the host's intention to treat guests, and it is not the guest's will to get them drunk and then cause some misfortune.