“I have changed my definition of tragedy. I now think tragedy is not foul deeds done to a person (usually noble in some manner) but rather that tragedy is irresolvable conflict. Both sides/ideas are right.”

Tragedy and the Common Man (1949)
Context: There is a misconception of tragedy with which I have been struck in review after review, and in many conversations with writers and readers alike. It is the idea that tragedy is of necessity allied to pessimism. Even the dictionary says nothing more about the word than that it means a story with a sad or unhappy ending. This impression is so firmly fixed that I almost hesitate to claim that in truth tragedy implies more optimism in its author than does comedy, and that its final result ought to be the reinforcement of the onlooker's brightest opinions of the human animal.
For, if it is true to say that in essence the tragic hero is intent upon claiming his whole due as a personality, and if this struggle must be total and without reservation, then it automatically demonstrates the indestructible will of man to achieve his humanity.

From a PBS interview with Amos Oz. The entire interview http://www.pbs.org/newshour/bb/middle_east/jan-june02/oz_1-23.html

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

Congress not involved in 1984 anti-Sikh riots: Rahul Gandhi in London https://www.hindustantimes.com/india-news/congress-not-involved-in-1984-anti-sikh-riots-rahul-gandhi-at-lse/story-lTkJdzh1N2R72W8Oqn6i0L.html Hindustan Times Aug 25, 2018
2018

Source: 1930s, Adventures of Ideas (1933), p. 285.

Source: Lady Midnight

In his introduction "Van is Here, But Van is Gone" to Futures Past: The Best Short Fiction of A. E. van Vogt (July 1999) http://www.sfrevu.com/ISSUES/2000/ARTICLES/20000128-03.htm
Context: Alfred E. van Vogt, since the appearance of his first two stories — "Black Destroyer" and "Discord in Scarlet" (Astounding Science Fiction, July and December 1939) the most memorable debut in the long history of the genre — has been a giant. The words seminal and germinal leap to mind. Sadly, at this juncture. the words tragedy and farewell also insinuate themselves. … Van is still with us, as I write this, in June of 1999, slightly less than fifty years since I first encountered van Vogt prose in a January 1950 issue of Startling Stories, but Van is gone. He is no longer with us. … Because the great and fecund mind of A. E. van Vogt has fallen into the clutches of that pulp thriller demon, Alzheimer's. Van is gone. … Anyone's demise or vanishment is in some small way tragic but the word "tragedy" requires greater measure for its use. … Van' s great mind now gone. Tragedy.
The ultimate tragic impropriety visited on as good a man as ever lived. A gentle. soft spoken man who was filled with ideas and humor and courtesy and kindness. Not even those who were not aficionados of Van's writing could muster a harsh word about him as a human being. He was as he remains now, quietly and purposefully, a gentleman.
But make no mistake about this: the last few decades for him were marred by the perfidious and even mean spirited and sometimes criminal acts of poltroons and self-aggrandizing mountebanks and piss-ants into whose clutches he fell just before the thug Alzheimer got him. … I came late to the friendship with Van and Lydia. Perhaps only twenty-five or so years. But the friendship continues, and at least I was able to make enough noise to get Van the Science Fiction Writers of America Grand Master Award, which was presented to him in full ceremony during one of the last moments when he was cogent and clearheaded enough understand that finally, as last, dragged kicking and screaming to honor him, the generation that learned from what he did and what he had created had, at last, fessed up to his importance.
Naturally, others took credit for his getting the award. They postured and spewed all the right platitudes. Some of them were the same ones who had said to me — during the five years it took to get them to act honorably — "we'd have given it to him sooner if you hadn't made such a fuss." Yeah. Sure. And pandas'll fly out of my ass.