This statement comes from Taoism. For example, the Taoist teaching "Cloud Seven Signs" says: "A lady has three souls, one is a fetus, the other is a cool spirit, and the other is a quiet spirit." The seven spirits are: dead dogs, lying arrows, bird yin, swallowing thieves, non-toxic, removing filth and stinking lungs, all of which are "ghosts in the body". Among them, three souls can follow human life, and seven souls are in charge of people's happiness, anger, sadness, fear, love, evil and desire. As long as any one of these seven feelings is amplified and intensified, it will make people persistent. For example, being angry because you killed your loved ones will make you persist in chasing the murderer all your life. The so-called obsession in Buddhism is also very similar to that in Taoism. Buddhists have eight right paths, both Mahayana Buddhism and Hinayana Buddhism. Mindfulness, positive determination and eight-way practice must be cut off from delusion, which is similar to obsession, that is, people will not give up what they have found because of greed, anger, delusion and evil. Even if it is only a moment of picking it up, you can't give up. A simple explanation of obsession is to subjectively identify the value of something and do something for yourself because of your own thoughts and emotions (much like Taoism). Pay more than the actual value. For example, we often see the love drama, persistently pursuing the protagonist (risking being killed by many fans), and finally the heroine is moved. This kind of thing can be classified as obsession. Obsession is not necessarily determined by the length of time, nor by the size of things. Obsession can be solved in an absolute moment, or it can be something that takes decades of hard work. Whether the emotion of doing something can be defined as obsession depends on the choice of value.