„Testing shows the presence, not the absence of bugs“

—  Edsger Dijkstra, Dijkstra (1969) J.N. Buxton and B. Randell, eds, Software Engineering Techniques, April 1970, p. 16. Report on a conference sponsored by the NATO Science Committee, Rome, Italy, 27–31 October 1969. http://homepages.cs.ncl.ac.uk/brian.randell/NATO/nato1969.PDF Possibly the earliest documented use of the famous quote.
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Edsger Dijkstra3
1930 - 2002
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„Program testing can be used to show the presence of bugs, but never to show their absence!“

—  Edsger W. Dijkstra Dutch computer scientist 1930 - 2002
Dijkstra (1970) " Notes On Structured Programming http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF" (EWD249), Section 3 ("On The Reliability of Mechanisms"), corollary at the end.

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„True peace is not merely the absence of tension: it is the presence of justice.“

—  Martin Luther King, Jr. American clergyman, activist, and leader in the American Civil Rights Movement 1929 - 1968
In a 1955 response to an accusation that he was "disturbing the peace" by his activism during the Montgomery Bus Boycott in Montgomery, Alabama, as quoted in Let the Trumpet Sound : A Life of Martin Luther King, Jr (1982) by Stephen B. Oates

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„Being is both presence and absence. God had to conceal His presence in order to bring the world into being.“

—  Abraham Joshua Heschel Polish-American Conservative Judaism Rabbi 1907 - 1972
Context: Being is both presence and absence. God had to conceal His presence in order to bring the world into being. He had to make His absence possible in order to make room for the world's presence. Coming into being brought along denial and defiance, absence, oblivion and resistance. Ch. 5<!-- The sense of the ineffable, p. 90 -->

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„The real value of tests is not that they detect bugs in the code, but that they detect inadequacies in the methods, concentration, and skills of those who design and produce the code“

—  C. A. R. Hoare British computer scientist 1934
Context: The real value of tests is not that they detect bugs in the code, but that they detect inadequacies in the methods, concentration, and skills of those who design and produce the code. How Did Software Get So Reliable Without Proof? Lecture Notes in Computer Science vol 1051 1996 pp. 1-17 : FME '96: Industrial Benefit and Advances in Formal Methods, Third International Symposium of Formal Methods Europe, Co-Sponsored by IFIP WG 14.3, Oxford, UK, March 18-22, 1996, Proceedings.

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„It is by presence of mind in untried emergencies that the native metal of a man is tested.“

—  James Russell Lowell American poet, critic, editor, and diplomat 1819 - 1891
Abraham Lincoln http://www.gutenberg.org/dirs/etext97/1lncn10h.htm (1864)

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