A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.
Manfred EigenA valid scientific theory is predictive, verifiable, and replicable. To me, that's beautiful.
Dean OrnishNever abandon a theory that explains something until you have a theory that explains more.
John McCarthywhat is new in his theories is not true, and what is true in his theories is not new.
Decline and Fall of the Freudian EmpireQuantum phenomena do not occur in a space. They occur in a laboratory.
Quantum Theory: Concepts and Methods