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For remember that in general we don't use language according to strict rules — it hasn't been taught us by means of strict rules, either.
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p. 25

 

Ludwig Wittgenstein

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Though the principles of the banking trade may appear somewhat abstruse, the practice is capable of being reduced to strict rules. To depart upon any occasion from these rules, in consequence of some flattering speculation of extraordinary gain, is almost always extremely dangerous, and frequently fatal to the banking company which attempts it.

 

Adam Smith

 

Men have an all but incurable propensity to try to prejudge all the great questions which interest them by stamping their prejudices upon their language. Law, in many cases, means not only a command, but a beneficent command. Liberty means not the bare absence of restraint, but the absence of injurious restraint. Justice means not mere impartiality in applying general rules to particular cases, but impartiality in applying beneficent general rules to particular cases. Some people half consciously use the word "true" as meaning useful as well as true. Of course language can never be made absolutely neutral and colourless; but unless its ambiguities are understood, accuracy of thought is impossible, and the injury done is proportionate to the logical force and general vigour of character of those who are misled.

 

James Fitzjames Stephen

 

Those that will combat use and custom by the strict rules of grammar do but jest.

 

Michel de Montaigne

 

Although mathematical notation undoubtedly possesses parsing rules, they are rather loose, sometimes contradictory, and seldom clearly stated. [...] The proliferation of programming languages shows no more uniformity than mathematics. Nevertheless, programming languages do bring a different perspective. [...] Because of their application to a broad range of topics, their strict grammar, and their strict interpretation, programming languages can provide new insights into mathematical notation.

 

Kenneth E. Iverson

 

People understand instinctively that the best way for computer programs to communicate with each other is for each of the them to be strict in what they emit, and liberal in what they accept. The odd thing is that people themselves are not willing to be strict in how they speak, and liberal in how they listen. You'd think that would also be obvious. Instead, we're taught to express ourselves.

 

Larry Wall