Express your heartfelt sympathies. Some example messages would be, please know I am thinking of you during this painful time.Sign off your sympathy card with something simple like "love" or "sincerely. Keep the letter as brief and as short as possible. "Please accept my condolences on the death of your ____. " "I am so sorry to hear about the passing of your _____." Please accept my sincere condolences on your loss. Your loss is immense, and there is no other loss that compares to your family's loss. My mother, Mary Ferris, passed away last night in Chicago, Illinois. In a few sentences, mention the loss and express your sincere sympathies.