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Knuth refers to this as "Hoare's Dictum" 15 years later in "The Errors of Tex", Software—Practice & Experience 19:7 (July 1989), pp. 607–685. However, the attribution to C. A. R. Hoare is doubtful.
--
All three of these papers are reprinted in Knuth, Literate Programming, 1992, Center for the Study of Language and Information ISBN 0937073806

 

Donald Knuth

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Over the years, many companies have contributed to free software development. Some of these companies primarily developed non-free software, but the two activities were separate; thus, we could ignore their non-free products, and work with them on free software projects. Then we could honestly thank them afterward for their free software contributions, without talking about the rest of what they did.
We cannot do the same with these new companies, because they won't let us. These companies actively invite the public to lump all their activities together; they want us to regard their non-free software as favorably as we would regard a real contribution, although it is not one. They present themselves as "open source companies," hoping that we will get a warm fuzzy feeling about them, and that we will be fuzzy-minded in applying it.
This manipulative practice would be no less harmful if it were done using the term "free software." But companies do not seem to use the term "free software" that way; perhaps its association with idealism makes it seem unsuitable. The term "open source" opened the door for this.

 

Richard M. Stallman

 

That doesn't make any sense. Sorry. There's no known way of saying an English sentence in which you begin a sentence with "in" and emphasize it. Get me a jury and show me how you can say "In July" and I'll go down on you. That's just idiotic, if you'll forgive me by saying so. That's just stupid... "In July"; I'd love to know how you emphasize "In" in "In July". Impossible! Meaningless!

 

Orson Welles

 

A word says more than a thousand images. Exercises for the visually inclined: illustrate "appreciation", "humor", "software", "education", "inalienable rights", "elegance", "fact".

 

Erik Naggum

 

Note: Voltaire cites this saying in his poem "La Bégueule" ("The prude woman") while ascribing it to an unnamed "Italian sage"; he also gives the saying (without attribution) in Italian (Il meglio ? l'inimico del bene) in the article "Art Dramatique" ("Dramatic Art", 1770) in the Dictionnaire philosophique.

 

Voltaire

 

The GNU GPL is not Mr. Nice Guy. It says "no" to some of the things that people sometimes want to do. There are users who say that this is a bad thing--that the GPL "excludes" some proprietary software developers who "need to be brought into the free software community."
But we are not excluding them from our community; they are choosing not to enter. Their decision to make software proprietary is a decision to stay out of our community. Being in our community means joining in cooperation with us; we cannot "bring them into our community" if they don't want to join.
What we can do is offer them an inducement to join. The GNU GPL is designed to make an inducement from our existing software: "If you will make your software free, you can use this code." Of course, it won't win 'em all, but it wins some of the time.

 

Richard M. Stallman