“A solution to one problem can not be totally applicable to other problems. It is said that there are no two problems that are exactly alike.”

Source: 1940s - 1950s, Introduction to Operations Research (1957), p. 8, cited in: R.L. McCown (2001) "Learning to bridge the gap between science-based decision support and the practice of farming". In: Aust. J. Agric. Res., Vol 52, p. 560-561

Source: 1980s, That Benediction is Where You Are (1985), p. 18
Context: From childhood we are trained to have problems. When we are sent to school, we have to learn how to write, how to read, and all the rest of it. How to write becomes a problem to the child. Please follow this carefully. Mathematics becomes a problem, history becomes a problem, as does chemistry. So the child is educated, from childhood, to live with problems — the problem of God, problem of a dozen things. So our brains are conditioned, trained, educated to live with problems. From childhood we have done this. What happens when a brain is educated in problems? It can never solve problems; it can only create more problems. When a brain that is trained to have problems, and to live with problems, solves one problem, in the very solution of that problem, it creates more problems. From childhood we are trained, educated to live with problems and, therefore, being centred in problems, we can never solve any problem completely. It is only the free brain that is not conditioned to problems that can solve problems. It is one of our constant burdens to have problems all the time. Therefore our brains are never quiet, free to observe, to look. So we are asking: Is it possible not to have a single problem but to face problems? But to understand those problems, and to totally resolve them, the brain must be free.

Re: How is perl braindamaged? (was Re: Is LISP dying?) http://groups.google.com/group/comp.lang.lisp/msg/37b0ddc2524a8214 (Usenet article)
Paraphrasing Jamie Zawinski, and also formulated as "The unemployed programmer had a problem. 'I know,' said the programmer, 'I'll just learn Perl.' The unemployed programmer now had two problems." in his famous "Perl treatise", Re: can lisp do what perl does easily? http://groups.google.com/group/comp.lang.lisp/msg/fc76ebab1cb2f863 (Usenet article).
Usenet articles, Perl

"Gauss's Abstract of the Disquisitiones Generales circa Superficies Curvas presented to the Royal Society of Gottingen" (1827) Tr. James Caddall Morehead & Adam Miller Hiltebeitel in General Investigations of Curved Surfaces of 1827 and 1825 http://books.google.com/books?id=SYJsAAAAMAAJ& (1902)
Context: In researches in which an infinity of directions of straight lines in space is concerned, it is advantageous to represent these directions by means of those points upon a fixed sphere, which are the end points of the radii drawn parallel to the lines. The centre and the radius of this auxiliary sphere are here quite arbitrary. The radius may be taken equal to unity. This procedure agrees fundamentally with that which is constantly employed in astronomy, where all directions are referred to a fictitious celestial sphere of infinite radius. Spherical trigonometry and certain other theorems, to which the author has added a new one of frequent application, then serve for the solution of the problems which the comparison of the various directions involved can present.

Source: Outside Ethics (2005), p. 9.

Partly cited in: Jean-Marc Choukroun, Roberta Snow (1992) Planning for human systems: essays in honor of Russell L. Ackoff. p. 287.
1950s, The development of operations research as a science, 1956

Source: "Foundations of the Theory of Signs," 1938, p. 57

Source: 1970s, Redesigning the future, 1974, p. 21 as cited in: Frederick M. Zimmerman (2011) From Riches to Rags at a Time of Prosperity, p. 12.

Some sources indicate the phrase 'government is the problem' was not part of the speech. (E.g. yale.edu http://avalon.law.yale.edu/20th_century/reagan1.asp). Live recordings of the address demonstrate that Reagan did indeed use the phrase in question. See Ronald Reagan: First Inaugural Address http://www.youtube.com/watch?v=IleiqUDYpFQ; start at 6:08
1980s, First term of office (1981–1985), First Inaugural address (1981)
Variant: In this present crisis, government is not the solution to our problem; government is the problem
Context: In this present crisis, government is not the solution to our problem; government is the problem. From time to time we've been tempted to believe that society has become too complex to be managed by self-rule, that government by an elite group is superior to government for, by, and of the people. Well, if no one among us is capable of governing himself, then who among us has the capacity to govern someone else? All of us together, in and out of government, must bear the burden. The solutions we seek must be equitable, with no one group singled out to pay a higher price.