For example, if we are cranky, we sometimes mistakenly explain our mood by saying that people around us are rude, or that drivers in traffic are selfishly blocking us. It is sometimes difficult to think that we're cranky "just because."
Some people have a biochemical explanation for their depression and their biochemistry changes over time. It could be that their brains fix themselves, and as they get better, their reason improves. But if you ask them, "what happened?" They say it was their reason.
In my own case, I have often claimed that I can improve my mood with endorphins through exercise and adrenaline sports like rock climbing. But others around me say that I have cause and effect backwards, that when I'm depressed I avoid exercise and when I get better, I start exercising again!
Depression is a tricky thing. The most valuable skill I ever learned is being able to mentally catch it early and reverse the thought processes before they become a problem.
All the little things help, from teaching yourself to intervene when a mood starts to swing negative, to challenging negative explanations and beliefs, to working on core beliefs, to drugs, endorphins, everything.
As of now, the most effective preventative measure for me has been focus. If I apply myself to thinking about something else, the problem goes away.
"What this cognitive shift to concrete thinking reflects, suggests Baumeister, is the brain’s attempt to slip into idle mental labor, thereby avoiding the suffocating feelings that we’ve been describing. Many suicidal college students, for example, exhibit a behavioral pattern of burying themselves in dull, routine academic busywork in the weeks beforehand, presumably to enter a sort of 'emotional deadness' which is 'an end in itself.' When I was a suicidal adolescent, I remember reading voraciously during this time; it didn’t matter what it was that I read—mostly junk novels, in fact—since it was only to replace my own thoughts with those of the writer’s. For the suicidal, other people’s words can be pulled over one’s exhausting ruminations like a seamless glove being stretched over a distractingly scarred hand."
http://blogs.scientificamerican.com/bering-in-mind/2010/10/2...
I decided that I'm simply too curious about what happens next to ever do it. Has helped ever since and eventually the thoughts faded away ... now suicide is merely a passing curiousity that momentarily pops into mind as a "Y'know, I wonder what it'd be like to just swerve into that truck coming down the opposite lane right now. There isn't actually anything stopping me from doing it ..."
Reason, it's a powerful tool.