Depression is Comfy

I've been thinking about the rationale behind depression--you know, the emotional rationale.   What's the reason for depression?  Why revert to it even when it exacts certain pain from its occupant?  It must provide some benefit, and that benefit, somehow, must be comfort, the ability to withdraw from the world and recharge (or not), the capacity to narrow one's mind into one's own life.  Because I think the world is increasingly overwhelming, and complicated and messy.  And depression doesn't sound good, mostly because it isn't.  But that also doesn't mean that it doesn't provide some benefits either.