This enables us to conclude and see beyond doubt whether someone is a Christian or not, in fact whether or not someone has any religion at all. People who do not regard adultery as a sin in their faith and their way of life are not Christians and have no religion. On the other hand, people who turn their backs on adultery as a sin, and more so people who steer clear of it altogether for that reason, and even more so people who detest it for that reason, do have a religion, and if they are in the Christian church, they are Christians.
There will be more on this in the booklet on marriage, though; and in the meanwhile those interested may consult what it says on this subject in Heaven and Hell, Sections 366-386.
from Life/Faith, Section 77
Heaven and Hell:
Section 366-386: Published 12/15/2017-12/22/2017