All of the lists of grave sins I’ve seen are based on the ten commandments, and expanded upon them. How do we know that the sins listed are grave? For example, under Thou Shalt Not Murder, it will talk about being angry with someone. Or under Thou Shalt Not Commit Adultery, it will list looking with lust. Are we to assume these are grave sins?
**1. Are all grave sins related to the ten commandments?
Is there some standard or rule by which we may judge whether a sin is serious?
If you’re not scrupulous, can you rely on your conscience to alert you to many or most grave sins? (I know the conscience is not totally reliable because there are some sins I know are serious that my conscience would not feel bad about.)**