“A business man once stated that there is nothing so practical as a good theory.”
Lewin (1943, 118), as cited in Karl E. Weick, "Theory and practice in the real world." in: The Oxford Handbook of Organization Theory, Tsoukas et al. (eds.), Oxford University Press, 2003, p. 460; Also in Lewin, K. (1951). Field theory in social science: Selected theoretical papers (D. Cartwright, Ed.). New York, NY: Harper & Row
1940s
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Kurt Lewin 48
German-American psychologist 1890–1947Related quotes

Comments to an undergraduate physics class about transformers, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

“Nothing can be more idle than the opposition of theory to practice!”
Source: A Treatise On Political Economy (Fourth Edition) (1832), Introduction, p. xxi
“One test of good theory is that it have practical implications.”
Source: 1970s, Organizational Analysis: A Sociological View, 1970, p. vii
Context: It is surprising how much discipline is imposed upon theory by requiring that it ‘make a difference’ and provide guidance or useful illumination. I learned long ago from students in professional schools that questions of ‘so what’ or ‘what relevance does this have’ do not signify impatience with theory per se, much less anti-intellectualism, but only impatience with the obvious, general, remote, and vague statements that often parade as social science theory. One test of good theory is that it have practical implications.

Michel Henry, Marx I. une philosophie de la réalité, éd. Gallimard, coll. « Nrf », 1976, p. 353
Books on Economy and Politics, Marx. A Philosophy of Human Being (1976)
Original: (fr) Parce que la pratique est subjective, la théorie qui est toujours la théorie d’un objet, ne peut atteindre la réalité de cette pratique, ce qu’elle est en elle-même, sa subjectivité précisément, mais seulement se la représenter, de telle manière que cette représentation laisse hors d’elle l’être réel de la pratique, l’effectivité du faire. La théorie ne fait rien.

“A good teacher offers practice, a bad one offers theories.”
Cultivation
One Minute Wisdom (1989)
Preface (1961) p. vi; Partly cited by Stephen E. Robertson (2011) " On retrieval system theory http://www.iskouk.org/conf2011/papers/robertson.pdf".
On Retrieval System Theory (1961)

“There is nothing which at once affects a man so much and so little as his own death.”
The Defeat of Death
The Note-Books of Samuel Butler (1912), Part XXIII - Death

On Practice (1937)