A theory must be tempered with reality. (Quote by - Jawaharlal Nehru)

Good tests kill flawed theories; we remain alive to guess again. (Quote by - Karl Popper)

The truly privileged theories are not the ones referring to any particular scale of size or complexity, nor the ones situated at any particular level of the predictive hierarchy, but the ones that contain the deepest explanations. (Quote by - David Deutsch)

Genetic theories, I gather, have been cherished academically with detachment. (Quote by - Allen Tate)

I know my theories and findings are hard for you to accept because they are so original and extraordinary. (Quote by - Alex Chiu)

Because essentially Schoenberg was an extremely gifted man. And in spite of many of his theories and so on, when he really began to write music, he still was guided very much by his internal hearing, by what we call your internal ear. (Quote by - Leo Ornstein)

How thoroughly it is ingrained in mathematical science that every real advance goes hand in hand with the invention of sharper tools and simpler methods which, at the same time, assist in understanding earlier theories and in casting aside some more complicated developments. (Quote by - David Hilbert)

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve. (Quote by - Karl Popper)

While there I began to study the Asian religions as theories of mind. (Quote by - Daniel Goleman)

Most of the research which is done is determined by the requirement that it shall, in a fairly obvious and predictable way, reinforce the approved or fashionable theories. (Quote by - Celia Green)

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory. (Quote by - Manfred Eigen)

The egoism which enters into our theories does not affect their sincerity; rather, the more our egoism is satisfied, the more robust is our belief. (Quote by - George Eliot)

In theory, there is no difference between theory and practice. But, in practice, there is. (Quote by - Manfred Eigen)

One of my theories is that men love with their eyes; women love with their ears. (Quote by - Zsa Zsa Gabor)

Our empirical criterion for a series of theories is that it should produce new facts. The idea of growth and the concept of empirical character are soldered into one. (Quote by - Imre Lakatos)

Before I married, I had three theories about raising children and no children. Now, I have three children and no theories. (Quote by - John Wilmot)

A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant. (Quote by - Manfred Eigen)

The credit which the apparent conformity with recognized scientific standards can gain for seemingly simple but false theories may, as the present instance shows, have grave consequences. (Quote by - Friedrich August von Hayek)

During the many centuries that magic, here on this planet, was presumed to have worked, there were at least as many theories as to how magic worked as there were cultures and religions. (Quote by - Lynn Abbey)

In art, theories are as useful as a doctor's prescription; one must be sick to believe them. (Quote by - Maurice de Vlaminck)

The wise man regulates his conduct by the theories both of religion and science. But he regards these theories not as statements of ultimate fact but as art-forms. (Quote by - John B. S. Haldane)

Facts do not speak for themselves. They speak for or against competing theories. Facts divorced from theories or visions are mere isolated curiosities. (Quote by - Thomas Sowell)

I believe without exception that theory follows practice. Whenever there is a conflict between theory and practice, theory is wrong. As far as I'm concerned, we make theories for what people have done. (Quote by - David Baker)

It is not my fault that certain so-called bohemian elements have found in my writings something to hang their peculiar beatnik theories on. (Quote by - Jack Kerouac)

The artist discards all theories, both his own and those of others. He forgets everything when he is in front of his canvas. (Quote by - Georges Rouault)