“There are two possible ways to solving a dilemma, in justice or elsewhere; begin with the facts, and follow out their logic where it leads one, or begin with the desired outcome, and reason backward to the necessary steps to achieve it.”
Source: Vorkosigan Saga, Captain Vorpatril's Alliance (2012), Chapter 24 (p. 527)
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Lois McMaster Bujold 383
Science Fiction and fantasy author from the USA 1949Related quotes

“It is necessary sometimes to take one step backward to take two steps forward.”

Source: The Expanding Circle: Ethics, Evolution, and Moral Progress (1981), Chapter 4, Reason, p. 88

Il y a aussi deux sortes de vérités, celles de Raisonnement et celle de Fait. Les vérités de Raisonnement sont nécessaires et leur opposé est impossible, et celles de Fait sont contingentes et leur opposé est possible.
La monadologie (33).
The Monadology (1714)

Speech in Birmingham (17 March 1939), quoted in The Times (18 March 1939), p. 12. On 15 March Hitler had invaded the rest of Czechoslovakia in contravention of the Munich Agreement.
Prime Minister

Leninism or Marxism? (1904)

On software patents, Quoted in "John Carmack: Knee Deep in the Voodoo" http://web.archive.org/web/20010624154450/http://www.voodooextreme.com/games/interviews/carmack/ Voodoo Extreme(2000-11-11)

Proposals Relating to the Education of Youth in Pensilvania (1749), p. 22 http://dewey.library.upenn.edu/sceti/printedbooksNew/index.cfm?textID=franklin_youth&PagePosition=1; the statement relates to the teaching of History as a subject, and the last quoted paragraph concludes with the footnote "†": Public Disputes warm the Imagination, whet the Industry, and strengthen the natural Abilities.
Context: History will also afford frequent Opportunities of showing the Necessity of a Publick Religion, from its Usefulness to the Publick; the Advantage of a Religious Character among private Persons; the Mischiefs of Superstition, &c. and the Excellency of the above all others antient or modern.
History will also give Occasion to expatiate on the advantage of Civil Orders and Constitutions, how men and their properties are protected by joining in Societies and establishing Government; their Industry encouraged and rewarded, Arts invented, and Life made more comfortable: the Advantages of Liberty, Mischiefs of Licentiousness, Benefits arising from good Laws and a due Execution of Justice &c. Thus may the first Principles of sound Politics be fixed in the minds of youth.
On Historical occasions, Questions of Right and Wrong, Justice and Injustice, will naturally arise, and may be put to Youth, which they may debate in Conversation and in Writing. When they ardently desire of Victory, for the Sake of the Praise attending it, they will begin to feel the want, and be sensible of the use of the Use of Logic, or the Art of Reasoning to discover Truth, and of Arguing to defend it, and convince adversaries.

Source: The leader of the future 2, 2006, p. xiv-xvii; preview

Debating Edward Teller, in The Nuclear Bomb Tests...Is Fallout Overrated? : Fallout and Disarmament KQED-TV, San Francisco http://osulibrary.oregonstate.edu/specialcollections/coll/pauling/peace/papers/1958p2.1.html (20 February 1958).
1940s-1960s
Context: We must not have a Nuclear war. We must begin to solve international disputes by the application of man's power of reason in a way that is worthy of the dignity of man. We must solve them by arbitration, negotiation, and the development of international law, the making of international agreements that will do justice to all nations and to all peoples and will benefit all nations and to all people. Now is the time to start.