Honest Abe: How Depressions Works

"The precipitating causes are hard to identify precisely, in part because cause and effect in depressive episodes can be hard to separate. Ordinarily we insist on a narrative line: factor x led to reaction y. But in a depressive crisis we might feel bad because something has gone awry. Or we might make things go awry because we feel so bad. Or both." (p. 56)