The first two books on this list forever changed my life and my way of thinking. They will do that for you too.
It is worth remembering that the first two books were published in 1952 and 1937 respectively so the language may take a little getting used to but WELL WORTH THE EFFORT.
THE POWER OF POSITIVE THINKING – Norman Vincent Peale
THINK AND GROW RICH – Napoleon Hill (latest original revised version)
CREATING YOUR BEST LIFE – Caroline Adams Miller
This little bonus book on explaining SMART goals is simple and can be read in one sitting
THE ART OF SETTING S.M.A.R.T. goals – Anisa Marku