When a corporate client quit drinking and improved his diet, I sent this note. Anytime I'm working well with a client, I think of them as a friend, and they seem to appreciate the gesture.
4/11-
Dear Terry,
Congratulations on the lifestyle changes you've made. It's difficult—it takes willpower—but as a friend, I'm glad to hear that you're taking better care of yourself. I know it means a longer, happier life.
Your friend,
Bill Frank