How to write and send a sympathy card
If you feel so inclined, consider adding an additional personal touch, such as a photo or meaningful quotation. A simple search online can be a great place to start, and sites such as BrainyQuote do a good job of collecting beautiful words.
There are hundreds of approaches for expressing your feelings during a difficult time, so what you need to remember is that if your message is from the heart and sincere, it will likely resonate with and be meaningful to your recipient.
Handwriting your message is generally considered most personal, so avoid typing if you can.