It involves nature because people find it relevant, as most have seen it or felt that it draws inspiration from it in using his writings. Hawthorne uses the forest to create two different major themes and show that the amount of lighting in a scene is absolutely important. If there were no references to nature in The Scarlet Letter, it would hardly be considered a classic as it is today. Hawthorne makes nature a crucial part of his novel, creating scenes full of nuances of joy, fear, innocence, and guilt. This is why The Scarlet Letter, among some of Hawthorne's other works, is important to American history.