One good sample thank you card message is, "Your thoughtfulness is a gift I will always treasure." Another simple thank you message states, "Sometimes the simplest things mean the most."
The type of thank you message depends on who is sending the card and what the recipient did to earn the card, Hallmark explains. For pre-printed thank you cards, add a short message stating what the recipient is being thanked for, followed by an emotional message.
To thank someone for a gift, specify what the person gave in the thank you message. A sample message is, “The gift you sent for my birthday is perfect! I can tell you spent a lot of time picking it out, and it makes me smile to think about how thoughtful you are.”
For major life events, use a sample message such as, “Thank you for adding to the joy of our wedding with your warm wishes and thoughtful gift." Specify which life event the recipient attended, and talk about the recipient's gift.
After receiving money or a gift card, use a sample message that says, "Thank you for your thoughtful and generous gift. I haven’t decided how I’ll use it yet, but I wanted you to know how happy and grateful I am."
To thank someone for help or hospitality, use messages such as, "This has been a challenging time, and I appreciate you so much" or, "My heartfelt thanks to you for opening your home to me during my visit."