Everything is duty to Nathaniel and this, despite Peter's extensive traveling, is what Peter ultimately succumbs too. During Peters more mentally distressing years, when he is in his mid-thirties, we begin to see him fall into the practice of duty for duties sake. His views on marriage are a distressing prevalence of his commitment to duty. He describes his wife Harriet in a surgical way. Peter, whom his wife refers to as Dr. Alden, has a very dutiful sense of what marriage is. He says that Harriet has no sense of humor, but he doesn't care because he is only looking for peace, not companionship. He describes Harriet as “a first rate woman” and says that if he tried to fare better in finding a mate he would probably fare worse, so why not just take her. He is just like his older brother Nathaniel at this point; he is introverted, anti-social, mechanical, and cold. He does, however, respect duty, and this, for better or worse, is what he uses to validate his existence.