Good anniversary card messages from one partner to another are "I love you for not only who you are, but for who I am when I am with you," and "Happy Anniversary to the love of my life." Another romantic expression is to include a phrase from the wedding vows.
Other appropriate messages between wives and husbands are "My love for you grows stronger every year," "I love you just as much as I did on our wedding day," and "After [number of] years, I still feel like we're newlyweds."
For people sending anniversary cards to others, handwritten remarks express joy and good wishes for the couple, such as "Happy 1st Anniversary. Looks like marriage really agrees with you two!" and "Love makes life sweeter in so many ways. Wishing many more years of sweetness to a couple who deserves only the best!"