I'm a 13 years sober member of AA and have several serious mental illnesses. It was in AA, and then therapy further on that Gratitude Lists were suggested to me. I couldn't say I have the rigour suggested of doing a gratitude list every single day, but it is close. It's part of promoting positive Plastic Brain Change. I'm going to use the list di meliora provided. I'm doing similar things in my ACT and Mindfulness, so it's another string to my bow. Thanks di meliora.