“Politics cannot be a science, because in politics theory and practice cannot be separated, and the sciences depend upon their separation.”

"Pass The Torch: Harry Belafonte" at DVRepublic (2005) http://www.dvrepublic.com/view.php?stid=11
Context: My social and political interests are part of my career. I cannot separate them. My songs reflect the human condition. The role of art isn't just to show life as it is, but to show life as it should be.

Source: Full House (1996), Chapter 14, “The Power of the Modal Bacter” (p. 195)

[Edwin E. Salpeter, The initial mass function 50 years later, Edvige Corbelli, Francesco Palla, Hans Zinnecker, Springer, 2005, 1402034075, 10]

Source: The Heritage Universe, Convergence (1997), Chapter 6 (p. 317)

"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Context: The evil influence of the supposed inconsistency of theory and practice upon speculative science, although much less conspicuous than it was in the ancient and middle ages, is still occasionally to be traced. This it is which opposes the mutual communication of ideas between men of science and men of practice, and which leads scientific men sometimes to employ, on problems that can only be regarded as ingenious mathematical exercises, much time and mental exertion that would be better bestowed on questions having some connection with the arts, and sometimes to state the results of really important investigations on practical subjects in a form too abstruse for ordinary use; so that the benefit which might be derived from their application is for years lost to the public; and valuable practical principles which might have been anticipated by reasoning, are left to be discovered by slow and costly experience.<!--pp. 175

New Mindset on Consciousness (1987)
Context: Instead of maintaining the traditional separation of science and values, cognitive theory says the two come together in brain function. If we are correct in saying that our conscious mental values not only arise from, but also influence brain processing, then it becomes possible to integrate values with the physical world on a scientific rather than supernatural basis. It's been the traditional role of religion to affirm the primary importance of our higher values in this world by invoking a supreme power. In cognitivism, it is science that affirms the powerful controlling role of higher values, and it is able to do so on grounds that are verifiable — that is, testable against reality as it really is.
On these new terms, science no longer upholds a value-empty existence, in which everything, including the human mind, is driven entirely by strictly physical forces of the most elemental kind. We get a vastly revised answer to the old question "What does science leave to believe in?" that gives us a different image of science and the kind of truth science stands for. This new outlook leads to realistic, this world values that provide a strong moral basis for environmentalism and population controls and for policies that would protect the long-term evolving quality of the biosphere.

Source: The Devil's Dictionary and Other Works

"Conversation with Systematic Liberalism," Forum (September 1961). <!-- p. 6. ; also in Friedrich Hayek : A Biography (2003) by Alan O. Ebenstein-->
1960s–1970s
Context: nowiki>[Apartheid law in South Africa] appears to be a clear and even extreme instance of that discrimination between different individuals which seems to me to be incompatible with the reign of liberty. The essence of what I said [in The Constitution of Liberty] was really the fact that the laws under which government can use coercion are equal for all responsible adult members of that society. Any kind of discrimination — be it on grounds of religion, political opinion, race, or whatever it is — seems to be incompatible with the idea of freedom under the law. Experience has shown that separate never is equal and cannot be equal.

Power and Prosperity: Outgrowing Communist and Capitalist Dictatorships (2000), Ch. 1 The Logic of Power