“Relativity and… quantum… remain incomplete…. the main reason each is incomplete is the existence of the other. The mind calls for a third theory to unify all of physics, and for a simple reason. Nature is… "unified." …interconnected, in that everything interacts with everything else.”

The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next (2007)

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American cosmologist 1955

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“The development during the present century is characterized by two theoretical systems essentially independent of each other: the theory of relativity and the quantum theory. The two systems do not directly contradict each other; but they seem little adapted to fusion into one unified theory.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

"The Fundamentals of Theoretical Physics," (1940) as quoted in Out of My Later Years (1976)
1940s

“In both quantum theory and general relativity, we encounter predictions of physically sensible quantities becoming infinite. This is likely the way that nature punishes impudent theorists who dare to break her unity. …If infinities are signs of missing unification, a unified theory will have none. It will be what we call a finite theory.”

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“In Theories of Everything… John Barrow argued that Gödel's incompleteness theorem undermines the very notion of a complete theory of nature. Gödel established that any moderately complex system of axioms inevitably raises questions that cannot be answered about the axioms. The implication is that any theory will always have loose ends. Barrow also pointed out that a unified theory of particle physics would not really be a theory of everything, but only a theory of all particles and forces. The theory would have little or nothing to say about phenomena that make our lives meaningful, such as love or beauty.”

John Horgan (journalist) (1953) American science journalist

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“Combine general relativity and quantum theory into a single theory that can claim to be the complete theory of nature. This is called the problem of quantum gravity.”

Lee Smolin (1955) American cosmologist

The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next (2007)

“God is simple. Everything else is complex. Do not seek absolute values in the relative world of nature.”

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Source: Autobiography of a Yogi:

“The last thirty years of Einstein's life were largely devoted to a search for a so-called unified field theory that would unify James Clerk Maxwell's theory of electromagnetism with the general theory of relativity, Einstein's theory of gravitation. Einstein's attempt was not successful, and with hindsight we can now see that it was misconceived. Not only did Einstein reject quantum mechanics; the scope of his effort was too narrow. … Nevertheless Einstein's struggle is our struggle today. It is the search for a final theory.”

Steven Weinberg (1933) American theoretical physicist

page 18, 2nd edition https://books.google.com/books?id=Qd0MEtsBr7oC&pg=PA18 <br class="br">Dreams of a Final Theory (1992; 2nd edition 1994)

“Seeing our common-sense conceptual framework for mental phenomena as a theory brings a simple and unifying organization to most of the major topics in the philosophy of mind.”

Paul Churchland (1942) Canadian philosopher

Source: "Eliminative materialism and the propositional attitudes," 1981, p. 68: About "Why folk Psychology is a theory."

“We understand God by everything in ourselves that is fragmentary, incomplete, and inopportune.”

Emil M. Cioran book History and Utopia

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“The various segments of the system of profound knowledge proposed here cannot be separated. They interact with each other. Thus, knowledge of psychology is incomplete without knowledge of variation.”

W. Edwards Deming (1900–1993) American professor, author, and consultant

The New Economics for Industry, Government, Education (1993)

“A very plausible choice for when inflation might have happened would be when the energy scales of the universe were at the scale of grand unified theories… which unify the weak, strong and electromagnetic interactions into a single unified interaction... we're talking about energies which are about 1016 times the equivalent energy of a proton mass. …the initial patch would only have to be the ridiculously small size of about 10-28 cm across to be able to lead ultimately to the creation of everything that we see on the vast scale of which we see it.”

Alan Guth (1947) American theoretical physicist and cosmologist

Lecture 1: Inflationary Cosmology: Is Our Universe Part of a Multiverse? Part I.
The Early Universe (2012)

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