Kuhn, Thomas

"We see what our training has prepared us to see."

"The scientist who cannot tolerate ambiguity will never make a revolutionary discovery."

"Progress requires both defenders of tradition and architects of revolution."

"The puzzle becomes visible only to those trained within the paradigm."

"Revolutions in science are revolutions in vision as much as in theory."

"The mature science is one that can absorb its own history."

"Scientific truth is not discovered but constructed through community agreement."

"The anomaly that cannot be explained is more valuable than the fact that fits the theory perfectly."

"Language and thought are so intertwined that changing one requires changing the other."

"The scientist's bias toward saving the established theory is often its saving grace."

"We mistake our maps for the territory and become lost in our own symbols."

"Revolutionary science emerges when the costs of defending a paradigm exceed the costs of abandoning it."

"The puzzle-solver pursues normal science; the rebel pursues extraordinary science."

"Incommensurability explains why opponents in a paradigm war cannot simply compare evidence."

"The crisis phase is when science becomes most interesting to philosophers."

"We inherit not just knowledge but ways of seeing that we rarely question."

"The scientific revolution was not about discovering new facts but about seeing old facts differently."

"Authority in science is maintained through education and professional community, not force."

"The anomaly is the beginning of all genuine scientific discovery."

"To change how science is practiced, one must change how scientists are trained."

"The paradigm is both what makes science possible and what can make it rigid."

"Scientific revolutions are not about better eyes but about different eyes."

"The greatest barrier to new discovery is success with the old theory."

"Paradigm shifts require not just intellectual conversion but emotional commitment."

"The scientist defending an older paradigm is not irrational; he follows the logic of his time."

"What we call the history of science is often a projection of current categories backward in time."

"The community, not the individual, is the fundamental unit of scientific change."

"Normal science is conservative by necessity; revolutionary science is radical by necessity."

"The crisis in physics is not solved by better calculations but by better concepts."

"We confuse the puzzle with the mystery and become trapped in our own questions."