"People with low flames are hard to escape once they meet, and it is best to swear." The meaning of this sentence is that people who are light or prone to "evil" in birthdates are hard to escape if they meet a drowning ghost, and swearing will scare the ghost away.
This is a superstitious saying: people have three fires, and ghosts and evil spirits dare not approach. On the top of the head and on the left and right shoulders. It is said that people can't see, and only ghosts can see at night. If someone calls you behind your back, as soon as you turn around, the breath will blow a fire on your shoulder. So the flame is low.
There is also a kind of birthday light (called bone fortune-telling index) that people will naturally have a low flame. Such people are generally weak and sickly, and are easily called "upper body" by ghosts.
Extended data:
In the book Exploration of Mysterious Phenomena: Revealing Life in the Spiritual World, Miao Xingzhuang, the author, puts forward a materialistic theistic system and thinks that there is indeed a "spiritual world" in the world.
The so-called "ghost" is actually the soul that all kinds of creatures continue to exist after leaving the body, and this spiritual body is also made of a certain substance, but we don't know much about this substance. Therefore, admitting that there are "ghosts" is not idealism and superstition.
The author believes that there are several different ways to communicate with people in the spiritual world, one of which is to communicate through hallucinations, so people who see ghosts do not really see ghosts with the naked eye, but an image formed through hallucinations. But this illusion is not created out of thin air, but the result of spiritual body (ghost) stimulating the visual center of human brain.