I walked through the
sand dunes in southern
Colorado once. Long, high, massive mounds of sand, in giant waves. If you hike in between two of them, all you can see if the patch of sky just above your head. From down in between them, it was easy to believe that the mountains no longer existed on one side, or the plains on the other. All I could see was sand on either side.
That's what depression is. The pit seems so deep that nothing is in front of you but an insurmountable wall. And behind you, past the edges, you can only see the tops of the good things in your past, they seem so small and insignificant. It's hard to realize that if you keep walking, you'll come on up the other side, and be able to see everything in perspective. It's so hard to realize that, that some people stop walking, and give up. Those people never climb out of the pit, because just laying at the bottom becomes easier after a while.