The gray scale is a system of judging a persons deeds- good
versus bad. For an individual, it is constantly changing with
every action they preform. Luckily for most, it does not
judge a persons thoughts.
This system was designed by Lucifer, and attached to every
human. All humans are born with a gray status of white. Although
everyone has a gray status, it only matters after death- to
decide if someone is an angel or a demon. Acts are mostly
judged by selfishness- was the act carried out in the
interest of others or self? Level of enjoyment is also a
factor- did the person enjoy committing the 'sin' or not?