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As St. John says, “All wrongdoing is sin, but there is sin which is not mortal” just as “there is sin which is mortal” (1 John 5:16-17). So what sin is mortal and what is not?  A mortal sin is one that “destroys in us the charity without which eternal beatitude is impossible. Unrepented, it brings eternal death” (CCC 1874). That’s what makes it “mortal,” or deadly: it cuts us off from God forever, unless it is “redeemed by repenta …