Equus (Longman, [1973] 1993), p. 11
Conferː "Tragedy, for me, is not a conflict between right and wrong, but between two different kinds of right."
Interviewed by Mike Wood for the William Inge Center for the Arts. http://www.ingecenter.org/interviews/PeterShaffertext.htm
“… when two opposite points of view are expressed with equal intensity, the truth does not necessarily lie exactly halfway between them. It is possible for one side to be simply wrong.”
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Richard Dawkins 322
English ethologist, evolutionary biologist and author 1941Related quotes

“Protagoras asserted that there were two sides to every question, exactly opposite to each other.”
Protagoras, 3.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 9: Uncategorized philosophers and Skeptics

AIKMAN, Duncan, New York Times Magazine, February 19, 1933, p. 3 http://query.nytimes.com/gst/abstract.html?res=9A02E7DA1539E033A2575AC1A9649C946294D6CF&nytmobile=0&legacy=true

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)

"The Rage of Oriana Fallaci", in The New York Observer (27 January 2003)
Context: Our weakness in the West is born of the fact of so-called "objectivity." Objectivity does not exist. The word is a hypocrisy which is sustained by the lie that the truth stays in the middle. No, sir: Sometimes truth stays on one side only.

“A lie can be halfway round the world before the truth has got its boots on.”
Though widely quoted from his speech in the House of Commons, (1 November 1976) published in Hansard, House of Commons, 5th series, vol. 918, col. 976.; this is actually a very old paraphrase of a statement of the 19th century minister Charles Spurgeon: "A lie travels round the world while truth is putting on her boots." Even in the paraphrased form Callaghan used, it was in widely familiar, many years prior to his use of it, and is evidenced to have been published in that form at least as early as 1939.
Misattributed
“If two opposite theories are propagated one will be wrong.”
Nahj al-Balagha

Therefore, in order to do even a little, one has already to know a great deal and to know it well.
Source: Precepts and Judgments (1919), p. 175

1950's, On Being a Graphic Artist', 1953
Context: I do indeed believe that there is a certain contrast between, say, people in scientific professions and people working in the arts. Often there is even mutual suspicion and irritation, and in some cases one group greatly undervalues the other. Fortunately there is no one who actually has only feeling or only thinking properties. They intermingle like the colors of the rainbow and cannot be sharply divided. Perhaps there is even a transitional group, like the green between the yellow and the blue of the rainbow. This transitional group does not have a particular preference for thinking or feeling, but believes that one cannot do without either the one or the other. At any rate, it is unprejudiced enough to wish for a better understanding between the two parties... It is clear that feeling and understanding are not necessarily opposites but that they complement each other.