What do you you think is the most important quality of Gothic literature.

There are usually two qualities gothic literature; One is set to shock and frighten the reader while the other is constructed with the ability to create suspense and mysteries into the literature. I believe gothic literature should be more focused on suspense and mysteries rather than simply scaring the readers, because suspense grasps the reader's attention throughout the story. Although, if a gothic literature presents the goal to frighten people, in such ways as Edgar Alan Poe illustrates for his readers, then I believe it could also teach one's self about how they should understand fear. Both qualities performed in one piece of literature is the best by my opinion.