This kind of thinking is precisely why I stick around to argue about this subject when it pops up.
You have cause and effect reversed, and you're not up-to-date on current medical research. The science has advanced far beyond, "you're depressed because you're thinking bad things."
There is evidence linking it to intestinal bacteria: https://www.newscientist.com/article/2095769-gut-bacteria-sp... and also http://www.nature.com/news/gut-brain-link-grabs-neuroscienti...
And inflammation: http://bmcmedicine.biomedcentral.com/articles/10.1186/1741-7...
And circadian rhythm / sleep: http://www.independent.co.uk/news/science/new-forensic-techn... and https://www.scientificamerican.com/article/fighting-depressi...
I think it's likely that within the next 50 years a treatable, biological, root cause will be found which is somehow related to all of these, and I hope that by then the lay-public will have moved away from the opinion they share with Scientology.
> Your belief in the inevitability of depression is only leading to more depression.
You have misinterpreted the purpose of my comments. I'm not here to tell people with depression how to improve their lives, because I'm not qualified to do that (words which I wish everyone on HN would hear in their head before they write anything about anything). I'm just here to clear up common misconceptions about the causes of depression and what it's like to experience it.