Blind commitment to a theory is not an intellectual virtue: it is an intellectual crime.
Imre LakatosPhilosophy of science without history of science is empty; history of science without philosophy of science is blind.
Imre LakatosIt would be wrong to assume that one must stay with a research programme until it has exhausted all its heuristic power, that one must not introduce a rival programme before everybody agrees that the point of degeneration has probably been reached.
Imre LakatosIn degenerating programmes, however, theories are fabricated only in order to accommodate known facts
Imre Lakatos