“Above all else show the data.”
Source: The Visual Display of Quantitative Information
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Edward R. Tufte 3
American statistician (b.1942) noted for his writings on in… 1942Related quotes

“The emotions come closer than anything else to the vividness of inner data.”
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“Errors using inadequate data are much less than those using no data at all.”
Quoted in William Kenneth Richmond (1969), The Education Industry.
May be modern paraphrase of "the errors which arise from the absence of facts" quote above.
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About the true value of graphics
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Economic Control of Quality of Manufactured Product,1931

SGU Podcast #254, May 26th, 2010 http://www.theskepticsguide.org/podcast/sgu/254
The Skeptics' Guide to the Universe, Podcast, 2010s

No Maps for These Territories (2000)

Statement by the President https://www.whitehouse.gov/the-press-office/2016/07/07/statement-president (7 July 2016)
2016