Why do Catholics classify sins as “mortal” and “excusable”?
QUESTION: on what basis do Catholics divide sins into “mortal” and “everyday”? Are not all sins, without exception, mortal, excommunicating from God? There is no such distinction in the Bible. After all, it is written by the apostle James: “Whoever observes the entire law and sins in one thing, he becomes guilty of everything”?
ANSWER: It is a mistake to believe that the Bible does not distinguish between sins that are mortal and sins that are not. It is on the basis of the Bible that we make this distinction. It is already present in the Old Testament, where a significant part of sins also meant a death sentence. Here are some quotes.