“He may not have had time, but even allowing him the time, Vergil simply did not think such things through. Brilliant in the creation, slovenly in the consideration of consequences.
But wasn’t that true of every creator?
Didn’t anyone who changed things ultimately lead some people—perhaps many people—to death, grief, torment?”

The grand old man of American psychiatry on what he has learnt about life (and death) in his still-flourishing career, The Independent http://www.independent.co.uk/news/people/profiles/irvin-d-yalom-interview-the-grand-old-man-of-american-psychiatry-on-what-he-has-learnt-about-life-10134092.html

Source: Mrs. Dalloway

On Charles Evans Hughes, in November 1909, as quoted in Taft and Roosevelt : The intimate letters of Archie Butt (1930) by Archibald Willingham Butt, p. 224; this has sometimes been paraphrased: "Failure to accord credit to anyone for what he may have done is a great weakness in any man."

"The Figure of the Youth as Virile Poet"
The Necessary Angel (1951)
Context: It may be dismissed, on the one hand, as a commonplace aesthetic satisfaction: and, on the other hand, if we say that the idea of God is merely a poetic idea, even if the supreme poetic idea, and that our notions of heaven and hell are merely poetry not so called, even if poetry that involves us vitally, the feeling of deliverance, of a release, of a perfection touched, of a vocation so that all men may know the truth and that the truth may set them free — if we say these things and if we are able to see the poet who achieved God and placed Him in His seat in heaven in all His glory, the poet himself, still in the ecstasy of the poem that completely accomplished its purpose, would have seemed, whether young or old, whether in rags or ceremonial robe, a man who needed what he had created, uttering the hymns of joy that followed his creation. This may be a gross exaggeration of a very simple matter. But perhaps the same is true of many of the more prodigious things of life and death.

Statement after the suicide of Aaron Swartz, in "An Incredible Soul": Larry Lessig Remembers Aaron Swartz After Cyberactivist’s Suicide Before Trial; Parents Blame Prosecutor" at Democracy NOW! (14 January 2013) http://www.democracynow.org/2013/1/14/an_incredible_soul_lawrence_lessig_remembers
Context: I received an email from JSTOR four days before Aaron died, from the president of JSTOR, announcing, celebrating that JSTOR was going to release all of these journal articles to anybody around the world who wanted access — exactly what Aaron was fighting for. And I didn’t have time to send it to Aaron; I was on — I was traveling. But I looked forward to seeing him again — I had just seen him the week before — and celebrating that this is what had happened. So, all of us think there are a thousand things we could have done, a thousand things we could have done, and we have to do, because Aaron Swartz is now an icon, an ideal. He is what we will be fighting for, all of us, for the rest of our lives. … Every time you saw Aaron, he was surrounded by five or 10 different people who loved and respected and worked with him. He was depressed because he was increasingly recognizing that the idealism he brought to this fight maybe wasn’t enough. When he saw all of his wealth gone, and he recognized his parents were going to have to mortgage their house so he could afford a lawyer to fight a government that treated him as if he were a 9/11 terrorist, as if what he was doing was threatening the infrastructure of the United States, when he saw that and he recognized how — how incredibly difficult that fight was going to be, of course he was depressed.
Now, you know, I’m not a psychiatrist. I don’t know whether there was something wrong with him because of — you know, beyond the rational reason he had to be depressed, but I don’t — I don’t — I don’t have patience for people who want to say, "Oh, this was just a crazy person; this was just a person with a psychological problem who killed himself." No. This was somebody — this was somebody who was pushed to the edge by what I think of as a kind of bullying by our government. A bullying by our government.

Lyra's Oxford (2003)
Context: All these tattered old bits and pieces have a history and a meaning. A group of them together can seem like the traces left by an ionizing particle in a bubble chamber: they draw the line of a path taken by something too mysterious to see. That path is a story, of course. What scientists do when they look at the line of bubbles on the screen is work out the story of the particle that made them: what sort of particle it must have been, and what caused it to move in that way, and how long it was likely to continue.
Dr. Mary Malone would have been familiar with that sort of story in the course of her search for dark matter. But it might not have occurred to her, for example, when she sent a postcard to an old friend shortly after arriving in Oxford for the first time, that that card itself would trace part of a story that hadn't yet happened when she wrote it. Perhaps some particles move backward in time; perhaps the future affects the past in some way we don't understand; or perhaps the universe is simply more aware than we are. There are many things we haven't yet learned how to read.
The story in this book is partly about that very process.

Preface
Memoirs of a Superfluous Man (1943)

The Hour of Babel (p. 62)
Short fiction, The Bible Repairman and Other Stories (2011)

Cf. Bernard Shaw, Back to Methuselah (1921), Pt. I : In the Beginning: I hear you say "Why?" Always "Why?" You see things; and you say "Why?" But I dream things that never were; and I say "Why not?"
Books, Brain Droppings (1997)
Variant: Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that shit.