“Mainstream economics scholarship produces theory without facts ("pure theory") and facts without theory”

Ch. 1 : Experience as evidence http://www.marxists.org/reference/subject/philosophy/works/en/laing.htm
The Politics of Experience (1967)
Context: Even facts become fictions without adequate ways of seeing "the facts". We do not need theories so much as the experience that is the source of the theory. We are not satisfied with faith, in the sense of an implausible hypothesis irrationally held: we demand to experience the "evidence".
We can see other people's behaviour, but not their experience. This has led some people to insist that psychology has nothing to do with the other person's experience, but only with his behaviour.
The other person's behaviour is an experience of mine. My behaviour is an experience of the other. The task of social phenomenology is to relate my experience of the other's behaviour to the other's experience of my behaviour. Its study is the relation between experience and experience: its true field is inter-experience.

Introduction to Capital. Introduction to volume 1 (1976)

(speech at Center for Popular Economics, Summer Institute), 2006-07-27

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

Source: What Is This Thing Called Science? (Third Edition; 1999), Chapter 4, Deriving theories from facts: induction, p. 41.

This is declared to be "an old Kantian maxim" in General Systems Vol. 7-8 (1962)‎, p. 11, by the Society for the Advancement of General Systems Theory, but may simply be a paraphrase or summation of Kantian ideas.
Kant's treatment of the transcendental logic in the First Critique contains a portion, of which this quote may be an ambiguously worded paraphrase. Kant, claiming that both reason and the senses are essential to the formation of our understanding of the world, writes: "Without sensibility no object would be given to us, and without understanding none would be thought. Thoughts without content are empty, intuitions without concepts are blind (A51/B75)".
Disputed

The earliest published attribution of this quote to Einstein found on Google Books is the 1991 book The Art of Computer Systems Performance Analysis by Raj Jain (p. 507), but no source to Einstein's original writings is given and the quote itself is older; for example New Guard: Volume 5, Issue 3 from 1961 says on p. 312 http://books.google.com/books?id=5BbZAAAAMAAJ&q=%22fit+the+theory%22#search_anchor "Someone once said that if the facts do not fit the theory, then the facts must be changed", while Product engineering: Volume 29, Issues 9-12 from 1958 gives the slight variant on p. 9 "There is an age-old adage, 'If the facts don't fit the theory, change the theory.' But too often it's easier to keep the theory and change the facts." These quotes are themselves probably variants of an even earlier saying which used the phrasing "so much the worse for the facts", many examples of which can be seen in this search http://www.google.com/search?tbo=p&tbm=bks&q=facts+fit+%22so+much+the+worse+for+the+facts%22&tbs=,cdr:1,cd_max:Dec%2031_2%201950&num=10; for example, the 1851 American Whig Review, Volumes 13-14 says on p. 488 http://books.google.com/books?id=910CAAAAIAAJ&pg=PA488#v=onepage&q&f=false "However, Mr. Newhall may possibly have been of that casuist's opinion, who, when told that the facts of the matter did not bear out his hypothesis, said 'So much the worse for the facts.'" The German idealist philosopher Johann Gottlieb Fichte circa 1800 did say "If theory conflicts with the facts, so much the worse for the facts." The Hungarian Marxist Georg Lukacs in his "Tactics and Ethics" (1923) echoed the same quotation.
Misattributed

Introduction à l'Étude de la Médecine Expérimentale (1865)

Source: The Mysterious Affair at Styles (1920)