I came here to say: read this book, it's really great.

I think if your depression is very deeply buried, it surely isn't enough to read it, but still it can open up quit some insights regarding the connection of what you think and how you feel. It makes it visible.

There can also be other causes for depression is course.

While studying and testing the exercises described in the book I discovered one other thing I'd like to share: to me it seems, to come out of a reappearing mental dip, you need to be very consistent in your efforts (mental / physical exercises and other habits you try to establish or change, to feel better). Anyone else?