The Scarlet Letter can definitely be considered a timeless classic. First of all, it gives very good insight into what residing in the Puritan culture was like. Moreover, it offers perspective into what it was like when you did not abide by every strict belief they imposed within their societies. It offers criticism into their "pure" and "godly" ways by submitting Hester to public ostracism because she did something they did not approve of. It is a great example of one American society and how it functioned.
Hawthorne's language is so intricate and descriptive that it reveals so much about Hester's suffering and acceptance, Dimmesdale's suffering, as well as detailed explanations of the setting and the motivations Hawthorne feels drive the society. The writing style is beautiful.
The character development is immense with Hester, Dimmesdale, and Chillingworth. It develops slowly, but it is intricate and expertly done.
Finally, the novel is an exceptional example of the strength of the human heart. Hester gracefully accepts her fate, suffers alone, is tormented by the return of her husband, and learns to function in the community and move past her punishment.