“Impossible is not a fact. It’s an opinion!” – Muhammad Ali

Prior to May 6, 1954, most scientific experts believed that a man running a sub-four-mile physiologically impossible, Yet, Roger Bannister stunned the world running 3:59.4 despite widespread belief that it defied human limits.

The mindset “Impossible is an opinion” treats limits as temporary beliefs, not fixed reality. It shifts focus from what cannot be done to what might become possible through belief, action, learning, and persistence.

“Impossible” is usually a description of how something feels, not what is objectively true; it reflects fear, doubt, or lack of current knowledge and courage

The great heavy weight boxing champion Muhammad Ali captured this with: “Impossible is not a fact. It’s an opinion… Impossible is temporary. Impossible is nothing.”

Bannister later reflected that his achievement was a triumph of mindset over perceived limits.