“It is called a “pure” theory of law, because it only describes the law and attempts to eliminate from the object of this description everything that is not strictly law: Its aim is to free the science of law from alien elements. This is the methodological basis of the theory.”
Pure Theory of Law (revised ed., 1960), 1. The “Pure” Theory
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Hans Kelsen 6
Austrian lawyer 1881–1973Related quotes

Patheos, Orwellian Legislative Duplicity on HB 1485 http://www.patheos.com/blogs/reasonadvocates/2017/05/05/orwellian-legislative-duplicity-hb-1485/ (May 5, 2017)

Quoted in An Encyclopedia of Quotations About Music (1981) by Nat Shapiro, p. 268
Unsourced variant: There is no theory. You have only to listen. Fantasy is the law.
Context: There is no theory. You have only to listen. Pleasure is the law. I love music passionately. And because l love it, I try to free it from barren traditions that stifle it. It is a free art gushing forth — an open-air art, boundless as the elements, the wind, the sky, the sea. It must never be shut in and become an academic art.

Notice sur les Titres et Travaux scientifiques de Pierre Duhem rédigée par lui-même lors de sa candidature à l'Académie des sciences (mai 1913), The Aim and Structure of Physical Theory (1906)
Source: Just a Theory: Exploring the Nature of Science (2005), Chapter 2, “Just a Theory: What Scientists Do” (p. 24)

Source: The Province of Jurisprudence Determined (1832), p. 1; opening line
J. R. Partington, Higher Mathematics for Chemical Students (1911)

Reported in: Memorabilia Mathematica by Robert Edouard Moritz, quote #129.

Source: Time, Structure and Fluctuations (1977), p. 1; Introduction.