Theories are always very thin and insubstantial, experience only is tangible. (Quote by - Hosea Ballou)

Other psychological theories say a good deal about compensation. (Quote by - Allen Tate)

In making theories, always keep a window open so that you can throw one out if necessary. (Quote by - Bela Lugosi)

On the one hand we publicly pronounce the equality of all peoples; on the other hand, in our immigration laws, we embrace in practice these very theories we abhor and verbally condemn. (Quote by - Emanuel Celler)

I dare say that I have worked off my fundamental formula on you that the chief end of man is to frame general propositions and that no general proposition is worth a damn. (Quote by - Oliver Wendell Holmes, Jr.,)

No religious position is loyally served by refusing to consider annoying theories which may well turn out to be facts. (Quote by - Norman Lamm)

Theories pass. The frog remains. (Quote by - Jean Rostand)

Before I got married I had six theories about bringing up children; now I have six children, and no theories. (Quote by - John Wilmot)

The conceptions I have summarized here I first put forward only tentatively, but in the course of time they have won such a hold over me that I can no longer think in any other way. (Quote by - Sigmund Freud)

Our tradition of political thought had its definite beginning in the teachings of Plato and Aristotle. I believe it came to a no less definite end in the theories of Karl Marx. (Quote by - Hannah Arendt)

Theories are like scaffolding: they are not the house, but you cannot build the house without them. (Quote by - Constance Fenimore Woolson)

A hypothesis is something which looks as if it might be true and were true, and which is capable of verification or refutation by comparison with facts. (Quote by - Charles Sanders Peirce)

A people represents not so much an aggregate of ideas and theories as of obsessions. (Quote by - Emile M. Cioran)

Like all social theories, internationalism must seek its basis in the economic and technical fields; here are to be found the most profound and the most decisive factors in the development of society. (Quote by - Christian Lous Lange)

There's no such thing as 'facts of life'. Only standing theories that haven't been disproved as of yet. (Quote by - Simon Travaglia)

Theories of evolution must provide for the creative acts which brought such theories into existence. (Quote by - Michael Polanyi)

As a rule we disbelieve all the facts and theories for which we have no use. (Quote by - Gustave Flaubert)

Some of you may have been hoping that today I would speak about Lucien Bouchard's latest economic theories. But I have decided to spare him for the time being: after all, he is a man. (Quote by - Kim Campbell)

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. (Quote by - David Chalmers)

It is always incorrect to assume you can know what someone's moral convictions are based on their philosophical theories. (Quote by - Stanley Fish)

And now, without having wearied my friends, I hope, with detailed scientific accounts, theories, or deductions, I will only say that I have endeavoured to tell just the story of the adventure itself. (Quote by - Joshua Slocum)

I am an enthusiast, but not a crank in the sense that I have some pet theories as to the proper construction of a flying machine. I wish to avail myself of all that is already known and then, if possible, add my mite to help on the future worker who will attain final success. (Quote by - Wilbur Wright)

Learning to learn is to know how to navigate in a forest of facts, ideas and theories, a proliferation of constantly changing items of knowledge. Learning to learn is to know what to ignore but at the same time not rejecting innovation and research. (Quote by - Raymond Queneau)

I think philosophers can do things akin to theoretical scientists, in that, having read about empirical data, they too can think of what hypotheses and theories might account for that data. So there's a continuity between philosophy and science in that way. (Quote by - Robert Nozick)

From whichever angle one looks at it, the application of racial theories remains a striking proof of the lowered demands of public opinion upon the purity of critical judgment. (Quote by - Johan Huizinga)