Keep the letter as brief and as short as possible. Here are 10 tips on how to write a condolence letter and what to say and what not to say.What are some comforting words? Be sincere and express your feelings of sympathy. Our mutual friend, XXX let me know of your bereavement. I was very sorry to hear of XXX's passing. Here are some suggestions for expressing sympathy clearly and supportively to the bereaved. Email is fine, but avoid texting. You are in our thoughts and we offer our deepest condolences. " "Your coworkers are here to lend support and comfort during this time of sorrow.