Looking back, all the way through the thorns, because of their stupid and naive mistakes, looking forward to the previous fog, people feel dangerous, difficult and confused. Birth, old age, illness and death are all like this. From the beginning to the end, it has been reincarnation and repetition.
To a large extent, it is to persuade people to be open-minded and understand their own problems. Don't always live hopelessly like this. Persuade people to jump out of reincarnation and live a wise life again.