Theory Meets Reality In The Heartland by Bill Waddell:
Those who only think about theories don’t accomplish much. And those that don’t have theories don’t either. To achive success, theories need to be put to the test and modified as evidence shows flaws in the theory.
“Knowledge is built upon theory… Rational prediction requires theory and builds knowledge through systematic revision and extention of theory based on comparison of prediction with observation.” (Page 102, The New Economics by W. Edwards Deming).