Those who recognize the authority of the Scriptures will always have reference to them in these matters. Note that the author cites the Scriptures for many of his references.
Those who recognize the authority of logic and natural law will have reference to these.
Those who, believing themselves to be gods, make up their own rules will simply do whatever they will. Satanists, for example, fall into this last category.
There are a number of sins listed above, that have a qualifying word or phrase attached, such as...improper behavior, extreme, willfulness, inordinate, excessive, etc. What or who is the reference for these subjective levels? That is what I am asking