Since this is a personal card you can copy a poem or an excerpt to include in your card. I'd give credit to the original source though. Let me count the ways. And then you could add your own thoughts. Hold it horizontal.
Hand write or print the message on plain paper or type up and print out the poem or saying.
Fold this in the middle. You will place this inside the card you are creating. Fold the construction paper in half. The cover art can be done with a variety of methods. You do not have to be an artist to create an eye-appealing card.