Below you will find our collection of inspirational, wise, and humorous
old theory quotes, theory sayings, and theory proverbs, collected over the years from a variety
of sources.
Experience without theory is blind, but theory without experience is mere intellectual play.Immanuel Kant
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Never abandon a theory that explains something until you have a theory that explains more.John McCarthy
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Theory without data is myth: data without theory is madness.Phil Zuckerman
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Theories are private property, but truth is common stockCharles Caleb Colton
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We must alter theory to adapt it to nature, but not nature to adapt it to theory.Claude Bernard
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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.W. Edwards Deming
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In theory there is no difference between theory and practice. In practice there is.Yogi Berra
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A good scientific theory is one which is falsifiable, which has not been falsified.Richard Dawkins
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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.Charles Caleb Colton
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It is the theory which decides what can be observed.Albert Einstein
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The truth of a theory is in your mind, not in your eyes.Albert Einstein
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The difference between theory and practice is larger in practice than the difference between theory and practice in theory.Jan L. A. van de Snepscheut
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Leave your theories. All theories, you see, even those of virtue, are bad, foolish, mischievous.Romain Rolland
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The moment a person forms a theory, his imagination sees in every object only the traits which favor that theory.Thomas Jefferson
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Theories are usually the over-hasty efforts of an impatient understanding that would gladly be rid of phenomena, and so puts in their place pictures, notions, nay, often mere words.Johann Wolfgang von Goethe
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A theory is no more like a fact than a photograph is like a person.Edward W. Howe
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Generally the theories we believe we call facts, and the facts we disbelieve we call theories.Felix Cohen
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A theory must be tempered with reality.Jawaharlal Nehru
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All theories are legitimate, no matter. What matters is what you do with them.Jorge Luis Borges
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All theory, dear friend, is gray, but the golden tree of life springs ever green.Johann Wolfgang von Goethe
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Theory and practice sometimes clash. And when that happens, theory loses. Every single time.Linus Torvalds
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A young man is a theory, an old man is a fact.E.W. Howe
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Every theory is a self-fulfilling prophecy that orders experience into the framework it provides. Ruth Hubbard
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Theories are neither hunches nor guesses. They are the crown jewels of science.Carl Zimmer
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Those who say theory and practice are two unrelated realms are fools in one and scoundrels in the other.Ayn Rand
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The theory of rights enables us to rise and overthrow obstacles, but not to found a strong and lasting accord between all the elements which compose the nation. Giuseppe Mazzini
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Theory helps us to bear our ignorance of fact.George Santayana
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There is a distinction, but no opposition, between theory and practice. Each to a certain extent supposes the other. Theory is dependent on practice; practice must have preceded theory.Sir William Hamilton
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An ounce of action is worth a ton of theory. Friedrich Engels
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No theory is good unless it permits, not rest, but the greatest work. No theory is good except on condition that one use it to go on beyond.Andre Gide