Oswald Chambers has some wonderful things to say about depression. You can read it here.
Oswald Chambers
What is the “next thing” in your quest for wholeness?
Any action that takes our mind off our depression is a good thing, especially on a bad day. But exactly what?
When you worry about the future, keep God in the equation.
It's hard not to worry about the future. And when we're depressed it's even harder. But God says he is in our future just like he is in our present. ...
The gift of depression 