“The Marxist philosophy of dialectical materialism has two outstanding characteristics. One is its class nature: it openly avows that dialectical materialism is in the service of the proletariat. The other is its practicality: it emphasizes the dependence of theory on practice, emphasizes that theory is based on practice and in turn serves practice.”

—  Mao Zedong

On Practice (1937)

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Mao Zedong 181
Chairman of the Central Committee of the Communist Party of… 1893–1976

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“Discover the truth through practice, and again through practice verify and develop the truth. Start from perceptual knowledge and actively develop it into rational knowledge; then start from rational knowledge and actively guide revolutionary practice to change both the subjective and the objective world. Practice, knowledge, again practice, and again knowledge. This form repeats itself in endless cycles, and with each cycle the content of practice and knowledge rises to a higher level. Such is the whole of the dialectical-materialist theory of knowledge, and such is the dialectical-materialist theory of the unity of knowing and doing.”

Mao Zedong (1893–1976) Chairman of the Central Committee of the Communist Party of China

Concluding Paragraph
On Practice (1937)
Original: (zh-CN) 通过实践而发现真理,又通过实践而证实真理和发展真理。从感性认识而能动地发展到理性认识,又从理性认识而能动地指导革命实践,改造主观世界和客观世界。实践、认识、再实践、再认识,这种形式,循环往复以至无穷,而实践和认识之每一循环的内容,都比较地进到了高一级的程度。这就是辩证唯物论的全部认识论,这就是辩证唯物论的知行统一观。

Yogi Berra photo

“In theory there is no difference between theory and practice; in practice there is.”

Yogi Berra (1925–2015) American baseball player, manager, coach

Attributed in Nassim Nicholas Taleb, Antifragile - Things that Gain From Disorder (2012), p. 213.
The earliest known appearance of this quote in print is Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to Jan L. A. van de Snepscheut and Yogi Berra began to appear (and later still to various others).
Disputed, Misattributed

“In theory, there is no difference between theory and practice. But, in practice, there is.”

Jan L. A. van de Snepscheut (1953–1994) Dutch computer scientist

The earliest known appearance in print of this quote is Benjamin Brewster in the October 1881 - June 1882 issue of "The Yale Literary Magazine." Brewster asks, "What does his lucid explanation amount to but this, that in theory there is no difference between theory and practice, while in practice there is?" See page 202. https://books.google.com/books?id=iJ9MAAAAMAAJ&printsec=frontcover&vq=%22no+difference%22#v=onepage&q&f=false It has also been attributed by Doug Rosenberg and Matt Stephens (2007) Use Case Driven Object Modeling with UMLTheory and Practice p. xxvii as well as Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to van de Snepscheut and Yogi Berra began to appear (and later still to various others).
Misattributed

Mao Zedong photo

“Armed with Marxist-Leninist theory and ideology, the Communist Party of China has brought a new style of work to the Chinese people, a style of work that essentially entails integrating theory with practice, forging close links with the masses and practicing self-criticism.”

(zh-CN) 以马克思列宁主义的理论思想武装起来的中国共产党,在中国人民中产生了新的工作作风,这主要的就是理论和实践相结合的作风,和人民群众紧密地联系在一起的作风以及自我批评的作风。
1950s, On the Correct Handling of Contradictions Among the People (1957)

Honoré de Balzac photo

“Practice spoke its positive language to Theory whose word is always in the Future.”

Illusions perdues, part III. Ève et David (Ève and David), later Les Souffrances de l'inventeur (The Inventor's Sufferings).
Original: (fr) La Pratique parlait son langage positif à la Théorie dont la parole est toujours au Futur.

Paul Krugman photo

“In short, the success of macroeconomic activism, in both theory and practice, has made it possible for free market microeconomics to survive--again both in theory and in practice.”

Paul Krugman (1953) American economist

"Is the Economic Crisis a Crisis for Economics?", Slate (Nov. 13, 1998)

Mao Zedong photo

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