Wrong thoughts or wrong feelings?

I was searching the web for scientific studies about depression and found this on http://psychcentral.com/news/2011/11/18/practice-concrete-thinking-to-lessen-depression/31657.html

Immediately I thought of those goofy American think positive classes, where you stand in front of a mirror every day telling yourself what a wonderful person you are. And when you tell yourself a lie enough times you start to believe it. I always wondered, if those people really wanted to feel good about themselves, why don’t they just do something good. Give blood, do volunteer work or something, so they would have an actual reason to feel good.

I don’t know is this CNT the same kind of thing. I tried to find an example of the exorcises the patients do, but didn’t find any. Changing the way a person thinks just sounds so weird to me. I don’t have a problem with the way I think, my thoughts are pretty rational in my opinion. It’s my feeling that are the irrational ones. Sometimes I’m feeling bad, even if things are not worse than usual and sometimes when bad stuff happens, I feel just fine. It’s like the part of my brain that handles conscious thinking is not connected to the part that handles emotions.