Positive thinking needs to be an application, not a concept. Before we can do something we need to consider the negative, and positive in an objective light.
We can reach our goals with less difficulty, and perform in a manner that can exceed our expectations. While it seems like a basic concept, perhaps even patently obvious, there seems less and less evidence of positive thinking every day.
It is explained with a computer analogy in another paragraph:
- in > - out, + in < + out (He had =, but that leaves no room for improvement.)

there seems less and less evidence of positive thinking every day.

So VERY true.