Things to write in a card include a reference to the occasion that prompted the card and something personal between the writer and the recipient, such as an inside joke or a good memory. Appropriate card messages vary depending on the occasion and the writer's relationship to the recipient. However, the most effective card messages are consistent with the writer's personality.
Cards should include a reference to the reason for the card, whether it's a special occasion, a sympathy card, a get-well card or a "just because" card. If the card message already references the reason, mentioning it in the card message is optional.
Including something personal between the writer and the recipient makes the card stand out. If the writer doesn't know the recipient very well, a joke is another way to add to the card that doesn't require a close relationship.
Card messages that are consistent with the writer's personality tend to sound the most natural and be the easiest to write. A writer who doesn't say much can keep the message short and simple, while a writer who jokes around may want to incorporate multiple jokes. Writers should also consider talents that integrate well with a card message. For example, poetic writers can write a short verse, or artistic writers can draw a small design or even create a card themselves.