Also known as clearing the heart and uterus, it is a method to treat fever entering pericardium. Symptoms of heat entering pericardium include delirium, high fever, restlessness, red tongue and rapid pulse. The fever in pericardium can be treated with Qinggong decoction. In addition, in the fifth chapter of Matthew in the Bible, blessed are the pure-hearted, because they will meet God.
In addition to the tonsure ceremony, Buddhism also has a "pure heart" ceremony. After entering the temple, after a period of study, the old monks will light the first scar of their Buddhist career with incense, which is called "clearing the heart." Then in the next year or two, if you behave well, you are entitled to a second scar, named "love".