Sorry to say but I don't agree.
While it's true positive psychology sometimes help (largely depends on your mentality), it's also highly controversial. Also I might add that for depressed people, chances are these words feel hollow.
In the long run, saying self-praises over and over again can act as some kind of hypnosis and set you up for more disappointment in the future. The benefits of a stable self-esteem is higher than a high yet unstable one.

>>1 Holy shit, that wall of text.

And >>2 is right.

Also, Neko war