Dear Dr Smith, I want to express my gratitude for your help over the past several years, and let you know that I feel I'm at a place where I am no longer in need of your services. When I lacked the will to go on, I can say without hesitation that your care is what got me back on my feet. I'll keep your number in case of trouble down the road, but I'm confident that the worst is well behind me. From the bottom of my heart, I thank you for teaching me that it is not illness which determines destiny, but action. Sincerely,