You will perhaps have heard this very old story illustrating the difference between positive thinking and negative thinking:
Many years ago two salesmen were sent by a British shoe manufacturer to Africa to investigate and report back on market potential.
The first salesman reported back, “There is no potential here – nobody wears shoes”
The second salesman reported back, “There is massive potential here – nobody wears shoes”
This simple short story provides one of the best examples of how a single situation may be viewed in two quite different ways – negatively or positively.