A Quote by Friedrich August von Hayek

Without a theory the facts are silent. — © Friedrich August von Hayek
Without a theory the facts are silent.
Theory is worth but little, unless it can explain its own phenomena, and it must effect this without contradicting itself; therefore, the facts are sometimes assimilated to the theory, rather than the theory to the facts.
Mainstream economics scholarship produces theory without facts ("pure theory") and facts without theory ("applied economics").
Theory and fact are equally strong and utterly interdependent; one has no meaning without the other. We need theory to organize and interpret facts, even to know what we can or might observe. And we need facts to validate theories and give them substance.
Theory is the essence of facts. Without theory scientific knowledge would be only worthy of the madhouse.
All good intellects have repeated, since Bacon's time, that there can be no real knowledge but that which is based on observed facts. This is incontestable, in our present advanced stage; but, if we look back to the primitive stage of human knowledge, we shall see that it must have been otherwise then. If it is true that every theory must be based upon observed facts; it is equally true that facts can not be observed without the guidance of some theory. Without such guidance, our facts would be desultory and fruitless; we could not retain them: for the most part we could not even perceive them.
No theory ever agrees with all the facts in its domain, yet it is not always the theory that is to blame. Facts are constituted by older ideologies, and a clash between facts and theories may be proof of progress. It is also a first step in our attempt to find the principles implicit in familiar observational notions.
Almost all the other fellows do not look from the facts to the theory but from the theory to the facts; they cannot get out of the network of already accepted concepts; instead, comically, they only wriggle about inside.
If facts conflict with a theory, either the theory must be changed or the facts.
Those who cavalierly reject the Theory of Evolution, as not adequately supported by facts, seem quite to forget that their own theory it supported by no facts at all.
Even facts become fictions without adequate ways of seeing "the facts". We do not need theories so much as the experience that is the source of the theory. We are not satisfied with faith, in the sense of an implausible hypothesis irrationally held: we demand to experience the "evidence".
Experience by itself teaches nothing... Without theory, experience has no meaning. Without theory, one has no questions to ask. Hence, without theory, there is no learning.
I worked on true Baconian principles, and without any theory collected facts.
Facts are simple and facts are straight. Facts are lazy and facts are late. Facts all come with points of view. Facts don't do what I want them to. Facts just twist the truth around. Facts are living turned inside out.
If the facts don't fit your theory, just find some new facts.
A theory should not attempt to explain all the facts, because some of the facts are wrong
Facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts do not go away while scientists debate rival theories for explaining them. Einstein's theory of gravitation replaced Newton's, but apples did not suspend themselves in mid-air pending the outcome.
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