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"A theory can be proved by experiment; but no path leads from experiment to the birth of a theory."
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"Never worry about theory as long as the machinery does what it's supposed to do."

"Of thousands of others, nearer the centre of the explosion, there was no trace. They vanished. The theory in Hiroshima is that the atomic heat was so great that they burned instantly to ashes - except that there were no ashes."

"Although I know a lot of the previous shuttle flights, in theory, had their tasks laid out; but there were still some changes that came along for them."

"Theories crumble, but good observations never fade."

"If a philosophic theory is once ruled out of court, no one can tell when it will appear again."

"Never abandon a theory that explains something until you have a theory that explains more."

"Things are still in early stages, but one can imagine that as we build up and systematize our theories of these associations, and try to boil them down to their core, the result might point us toward the sort of fundamental principles I advocate."

"A unified theory would put us at the doorstep of a vast universe of things that we could finally explore with precision."
Explore more quotes by Manfred Eigen

"A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant."

"In theory, there is no difference between theory and practice. But, in practice, there is."

"A theory can be proved by experiment; but no path leads from experiment to the birth of a theory."
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