Learn how to write a resignational letter if you're quitting for personal reasons. A resignation letter should be written at least 30 days prior to the effective date of resignation.These top samples of resignation letters for personal reasons can be used as helpful templates when you are looking to resign due to personal circumstances. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. Simply write that you're leaving for "personal reasons" after stating your intent to resign and your last day of employment with the company. The Bronx Community Foundation, write to address our decision to resign from the foundation.