A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant.
- Manfred Eigen
Irrelevant, May, Third, Possibility
In theory, there is no difference between theory and practice. But, in practice, there is.
- Manfred Eigen
Practice, Difference, Theory, No Difference
A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.
- Manfred Eigen
Path, Proved, Leads, Experiment
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