"positive thinking & negative thinking"
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 shoe manufacturer to an island 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.
We could explain this also in terms of seeing a situation's problems and
disadvantages, instead of its opportunities and benefits.
When telling this story its impact is increased by using exactly the same
form of words (e.g., "nobody wears shoes") in each salesman's report.
This emphasizes that two quite different interpretations are made of a single
situation.