“That one should practice what one preaches is generally agreed, but anyone who has the indiscretion to preach what both he and his hearers practice must always incur—as Lord Chesterfield has incurred—the gravest moral reprobation.”
“English Aphorists,” p. 123
Reperusals and Recollections (1936)
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Logan Pearsall Smith 37
British American-born writer 1865–1946Related quotes

“Practice yourself what you preach.”
[F]acias ipse quod faciamus nobis suades.
Asinaria, Act III, scene 3, line 54 (line 644 of full Latin text).
Variant translation: Do you then yourself do that which you would be suggesting to us to do. (translator Henry Thomas Riley, 1912)
Asinaria (The One With the Asses)

“Learn knowledge and science from him who teaches it, even if he doesn't practice what he preaches.”
Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 299
Obituary written for himself as one "that would be satisfactory to me in the event of an undesired, but possible, exit" in October 1933, as quoted in "Featherisms" by Ted Landphair at VOA News (6 October 2008) http://blogs.voanews.com/tedlandphairsamerica/2008/10/06/featherisms/
Context: He was known to some people as a writer. In his writings he espoused thrift, industry, promptness, perseverance, and dependability. … As far as was possible, the subject of this sketch practiced what he preached. Some of his enemies point to this trait as his foremost weakness.

“One man practicing sportsmanship is far better than 50 preaching it.”
As quoted in The Reader's Digest Vol. 135 (1989), p. 34
Variant: One man practicing sportsmanship is better than a hundred teaching it.

Orthodox Order of Friars Minor http://www.apostle1.com/oofm-rule-of-life.htm/, Rule XII
Disputed, Preach the gospel, and if necessary, use words.

In a letter to Theo, from Isleworth England, Autumn 1876, (letter 79); as quoted in Vincent van Gogh, edited by Alfred H. Barr; Museum of Modern Art, New York, 1935 https://www.moma.org/documents/moma_catalogue_1996_300061887.pdf, p. 18
1870s

On being appointed the brand ambassador of VHP's Shrimad Ramayan Parichay Yojana Samiti, as quoted in " VHP takes Ramayan, Mahabharat to schools http://www.rediff.com/news/2006/feb/24vhp.htm" Rediff (24 February 2006)