I use Hallmark card making software that I found at Staples several years ago to print the sentiments in most of my cards.
The software isn't terribly expensive and it will print many different sizes of cards as well as stickers and other projects. It includes hundreds of sentiments and a good selection of clip art also.
You can select a card they've already composed and just print it out or use it like I do to enhance the cards you want to make.
The actual name of the software is Hallmark Card Studio.