How do you judge the seriousness of offenses against the 8th commandment? Obviously lying under oath or lying about someone committing adultery are mortal sins but when does gossip or exaggeration during conversation at work become grave enough to be considered a mortal sin? How can you judge for sure the gravity of sins against the 8th commandment??
Usually when one’s gossip negatively alters the opinion another has regarding a third person, one has committed a mortal sin—unless it is a common news item. This is a far more serious matter than most of us like to consider.
Fr. Vincent Serpa, O.P.