To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude. Learn how to write a resignational letter if you're quitting for personal reasons.Due to unforeseen circumstances, I must resign. 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. If you want to know how to write a simple resignation letter, here is a step-by-step guide with an example. Professional letter of resignation template​​ I'm writing to inform you of my decision to resign from my role as (Title) at (Company). Individuals can submit their own version of resignation or retirement, but may use the template if they wish to.