Taoism, a letter of guarantee from an apprentice to a master.

In religious practice, there is a clear distinction between the concepts of master and master. Master takes the teacher as his father, the teacher as his father, and treats the teacher with the affection of his father. Master is only a kind of honorific title for someone who is very experienced in a certain field, and there is no such mentoring relationship. Real disciples, disciples must swear in front of their ancestors, and the yin and yang circles will be certified. If there is a violation, the consequences will be very serious. You don't have to write any guarantee. And if you call the other person a master, there is no real mentoring relationship, let alone writing and cursing.