The Environment Envir. Like many people I have had to learn about positive thinking the long, hard way and many of the heavyweights you named have been my teachers. When you begin to gain a sense of your own power and capabilities it's actually quite astonishing. You also realize there is noone to blame for your failures but yourself. Perhaps that's why so many people hang on to their negativity.
Negative thoughts bring negative results.
Unfortunately, I have learned that the hard way. Used under License.