You come to nature with all her theories, and she knocks them all flat.

Well, it may be all right in practice, but it will never work in theory

Jealousy is the theory that some other fellow has just as little taste.

A discovery is generally an unforeseen relation not included in theory.

My theory of what makes people likeable stars is that they're likeable.

Learn by doing. Theory is nice, but nothing replaces actual experience.

I've got this theory that there is a Volvo in any sane person's future.

My theory was that what I had to do was make a study of human behavior.

A theory that you can't explain to a bartender is probably no damn good.

I have this theory: If you forgive someone, they can't hurt you anymore.

Read no history: nothing but biography, for that is life without theory.

Without a revolutionary theory there cannot be a revolutionary movement.

Ideals are great in theory ... but they don't work too well in real life.

I choose colors I like and will photograph well. I don't do color theory!

Theory without practice is just as incomplete as practice without theory.

Beautiful Evidence is about the theory and practice of analytical design.

My theory of hitting was just to watch the ball as it came in and hit it.

Jack's [Ma Yun ] theory is that whoever controls data controls the world.

There's far more truth in the Book of Genesis than in the quantum theory.

The catastrophist constructs theories, the uniformitarian demolishes them.

That's where I get my whole music theory from, my pops and my grandfather.

Periods. We all get periods. Once a month, yeah. That's what the theory is

The theory of evolution, like the theory of gravity, is a scientific fact.

It is amazing how much theory we can do without when work actually begins.

I have a theory that you can decide to make whatever day it is a good day.

I believe in the theory that one cannot make a good film; it just happens.

Theory must mediate between all previous truths and certain new experiences

A man is never more satisfied than when he is confirming a favorite theory.

We live beyond words, as also we live beyond computation and beyond theory.

Capitalism is a great idea in theory, but in practice it just doesn't work.

I have a theory that the truth is never told during the nine-to-five hours.

I am a misanthropic humanist... Do I like people? They're great, IN THEORY.

Don't believe the results of experiments until they're confirmed by theory.

Scientific theory is a contrived foothold in the chaos of living phenomena.

The whole intention of empirical economics is to force theory down to Earth.

My theory is this; I'm not a political songwriter. I'm an honest songwriter.

World-changing startups need to be premised on accurate contrarian theories.

The world is too complex for subsumption under any general theory of change.

Everyone knows, or has strongly suspected, that capital theory is difficult.

Frankly, these days, without a theory to go with it, I can't see a painting.

I think everybody has a bisexual nature. That's my theory. I could be wrong.

We do what we can, and then make a theory to prove our performance the best.

Every genuine test of a theory is an attempt to falsify it, or to refute it.

The state of the world, of course, is constantly changing, and so is theory.

I have a tendency to often share the point of view of the conspiracy theory.

I have a theory you shouldn't write a book unless you have something to say.

I think simplicity is a good guide: The more economical a theory, the better.

Genetic theories, I gather, have been cherished academically with detachment.

It's just something that I like, and I also don't buy into the ageism theory.

Another thing I must point out is that you cannot prove a vague theory wrong.

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