"Dame Melancholy may also appear as the embodiment and vision of depression, where she brings wisdom, as she did to Boethius, who was betrayed and thrown into prison when not yet forty. There his suicidal melancholy conjured the feminine figure of Wisdom, who dictated to him his Consolation of Philosophy. Depression and the awakening of one's genius are inseparable, say the texts. Yet for most of us there is much depression and little genius, little consolation of philosophy, only the melancholic stare--what to do, what to do." -- [James Hillman, Pg.212, A Blue Fire]
My experience with depressions have been plagued with ideas like: You're born with a chemical imbalance. This is just the way your great-grandfather was. What sin have you committed? You've got to get out of this and get yourself together.
Perhaps the consolation of philosophy wipes those away.