THE SCARLET LETTER

I like black cat books. There is many information inside the book about many facts appeared on it but saddly, they have not the complete audio.
I have learnt a lot about the Salem trials, about the witches, about reverenders, about religion in America, about how they settled , abou pagans, about puritans...
I would like to watch the film, but the book is quite good.
The end of the book is a sentence with the inscription of a tombstone: "ON A FIELD, SABLE, THE LETTER A, GULES."
Sable means: black
Gules means: red
I have found two explanations on the web for these words: first of it just talk about a description of a coat of arms: the coat of arms is a red letter (letter gules) appearing against a black background (sable field).
The other explanation is about an eternal punishment because it describes the judgment that still remains even after death. Awesome.