“My object has been, first to discover correct principles and then to suggest their practical development.”
On Electro-magnetic forces (March 10, 1840), in Annals of Electricity, Vol. 4, p. 484.
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James Prescott Joule 2
English physicist and brewer 1818–1889Related quotes
p, 125
Sudden Origins: Fossils, Genes, and the Emergence of Species (1999)

Source: Speech http://hansard.millbanksystems.com/commons/1848/jun/05/expulsion-of-the-british-ambassador-from in the House of Commons (5 June 1848).

No Compromise – No Political Trading (1899)

Quoted in "Abortion rate a tragedy, says Abbott" http://www.theage.com.au/articles/2004/03/16/1079199224910.html on www.theage.com.au, March 17, 2004.
2004

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。

On his teaching process in “Gregory Pardlo: How I Write” https://www.writermag.com/writing-inspiration/author-interviews/gregory-pardlo-how-i-write/ in The Writer (2019 Jul 17)

Source: 1950s, The development of operations research as a science, 1956, p. 270.

VII: On "Let a Hundred Flowers Blossom Let a Hundred Schools of Thought Content" and "Long Term Coexistence and Mutual Supervision"
On the Correct Handling of Contradictions Among the People