Battlefield of the mind by Joyce Myers

So I started reading a book that one of my roomates recommended to me years ago but I never got around to reading it until now. It is called "Battlefield of the mind" by Joyce Myers. The first few pages talked about how it is important to control what we think because what we think affects our actions. It talks about how it is impossible to have a positive life and a negative thought pattern. So many problems in today's world are a result of the lies that we have allowed ourselves to believe. Lies such as "I am to fat, klutzy, lazy etc....to amount to anything" or "Nobody cares about my opinion so why bother saying it" and more. Kind of puts a new spin on the saying "I think therefore I am"