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Program testing can be used to show the presence of bugs, but never to show their absence!
--
Dijkstra (1970) "Notes On Structured Programming, corollary at the end of section 3, On The Reliability of Mechanisms" (EWD249).

 

Edsger W. Dijkstra

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Program testing can be a very effective way to show the presence of bugs, but it is hopelessly inadequate for showing their absence.

 

Edsger W. Dijkstra

 

Show me a prison, show me a jail
Show me a pris'ner whose face has grown pale
And I'll show you a young man
With many reasons why
There but for fortune, go you or I.

 

Phil Ochs

 

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.

 

Abraham Joshua Heschel

 

Let me show you how to drive me crazy,
Let me show you how to make me feel so good,
Let me show you how to take me to the edge of the stars and back again.
You've gotta show me how to drive you crazy,
You've gotta show me all the things you wanna happen to you,
We've gotta tell each other everything, we always wanted someone to do.

 

Jim Steinman

 

Question number one is from someone who calls himself "The Controvert." He says, "Hi, Tina, I love you in the show. In my humble opinion, when a show pushes the boundaries, you end up with a lot of passionate people on both sides. What do you think of the criticism the show gets?" I think that people who say they love the show and they think it's great and they write good reviews of it, are-are correct and that people who don't like the show for any reason are probably-they're just confusing it with Studio 60.

 

Tina Fey