Seems to me that the positive thinking comes before the action. Without a positive self-image or some hope of success, you won't take any action.
Others put down positive thinking by saying it's like rose-colored glasses that ignore reality.
Seems to me that many people are knee-jerk negative in a way that ignores reality. It takes discipline to think positive, even when negative people try to pull you down. Like holding the steering wheel of a car to keep it from drifting off the road.
I like The Power of Positive Thinking by Norman Vincent Peale.
Fluff or substance? How has positive thinking helped you? What could help you more?