Here are 10 tips on how to write a condolence letter and what to say and what not to say. You will find ideas from seasoned Hallmark writers for good, helpful and hopeful things to write in a sympathy card.Be sincere and express your feelings of sympathy. "The loss of a mother leaves a void that words cannot fill. "I am deeply saddened to learn that your (mother, father, spouse, sibling, etc.) recently passed away. Please know that you have my deepest sympathy. Please accept my heartfelt condolences during this incredibly difficult time. Visit Lima Family Santa Clara Mortuary to start planning a funeral or cremation today. Contact us to learn how to plan for yourself or someone you love. Amy Wang, 4, of Santa Clara died June 5, 2012.