Side doors usually refer to small doors and side doors. "Left" means evil deviant, and left deviant, which is related to the ancient custom of respecting right. The ancients paid attention to the complementarity of odd and positive, taking right as positive and left as odd, and the meaning of side door and left road was just similar, so it became an idiom. Heresy refers to unorthodox academic schools or religious schools, and also refers to improper methods and approaches. In feudal society, it was often used to condemn witchcraft and magic that were not recognized by the government. About the classification of heresy, Han Shu? The explanation of "The Record of Sacrifice in the Suburb" can be used for reference: "People recite the right path of benevolence and righteousness, but don't follow the words of statutes, but call it a strange ghost, worship the side of worship, and seek to report to the temple without happiness ... All traitors confuse the audience and lean to the left." It can be seen that everything that orthodoxy can't tolerate is regarded as heresy, such as deviating from the traditional thoughts of benevolence, righteousness and morality, worshiping ghosts and gods and believing in witchcraft. , can be described as varied. Rulers of past dynasties hated heresy, as evidenced by the frequent witchcraft incidents in history. When Emperor Wu of the Han Dynasty, he was imprisoned for witchcraft. The jester's false accusation of extorting a confession has caused numerous unjust cases and false cases involving tens of thousands of people, and even aroused the armed rebellion in Wang Wei, leaving an endless legacy. Of course, sometimes rulers will label them as "deviant" in order to suppress new ideas and methods that threaten their rule. What is the "witchcraft" used in the side door? Jin Yong's fans are all too familiar with the plot of Zhang Wuji's great power on the top of the light and his defeat. Among them, the head of Huashan School is fresh in communication and secretly used "gold silkworm poison" in folding fans during wartime. What is this "gold silkworm poison"? Is it the same as "witchcraft" at the side door? Ancient side doors and left roads included witchcraft and magic. Witchcraft here refers to the behavior of witches who use witchcraft to hurt people. Witch, the original meaning is wish, pointing to pray for ghosts and gods. The "witch" of "witchcraft" is to harm people by praying for ghosts and gods. There are two meanings: first, artificially cultivated poisonous insects; One is to make people confused, crazy and lose sexual desire. The "law" of "witchcraft" is the latter meaning. There are many ways to harm people with magic: some carve the image of the enemy out of wood, and then stab the heart and nail the eye, thinking that this can harm the enemy; Some pretend to be possessed by ghosts and gods to deceive or intimidate others, and so on. The "method" in the novel refers to the poisonous insect cultivated artificially. Before liberation, it was still widely circulated in minority areas in southern China. There are many kinds of poison methods, such as the Mayfly method, the Horse Locust method, the gold silkworm method, the grass method, the insect picking method and so on. Generally, it is the most toxic one screened from many similar poisonous insects. Someone who puts methods into food when others are not looking. After eating it, people will be infected with poison and suffer from a chronic disease. From a modern point of view, this is a man-made strange disease, which is caused by the poison of many protozoa. Among all the methods, the most famous one is gold silkworm method, which is the prototype of "gold silkworm method poison" in "Eternal Dragon Slayer". The legendary gold silkworm method, shaped like a silkworm, is golden, "bending like a ring, eating silk brocade as much as eating leaves." Some people say that it is called "gold silkworm Method" because "every golden day, a fiend is like an arrow of Bai Niao, throwing dung and scraping it to poison people".