In the opening paragraph, clearly state that you are resigning from your position. In the opening paragraph, make it clear that you are retiring.In the opening paragraph, make it clear that you are retiring. Of the United States, I would like to thank the people of California for the honor of serving them in the U.S. Senate over the past four years. A retirement letter is a type of resignation letter, but the main difference is its purpose. Brent Taylor celebrated the news in a post on X, formerly Twitter, saying that he was pleased with the decision.