Imre Lakatos

“All methodologies have their philosophical credentials.”

“The history of science, of course, is full of accounts of how crucial experiments allegedly killed theories.”

“Blind commitment to a theory is not an intellectual virtue: it is an intellectual crime.”

“It is not that we propose a theory and Nature may shout NO; rather, we propose a maze of theories, and Nature may shout INCONSISTENT.”

“There is no 'falsification' before the emergence of a better theory.”

“A theory may be born refuted.”

“A 'refutation' is not an event which clashes a theory with an observation and brings about its elimination.”

“Philosophy of science is a guide to the historian of science.”

“The methodology of a research programme is a set of rules: some tell us what paths of research to avoid (negative heuristic), and others what paths to pursue (positive heuristic).”

“The demarcation between science and pseudoscience is not merely a problem of armchair philosophy: it is of vital social and political importance.”

“The history of science is a history of superseded theories.”