“Fantasy is a necessary ingredient in living, it's a way of looking at life through the wrong end of a telescope.”

Variant: I like nonsense, it wakes up the brain cells.

Proverbs from Plymouth Pulpit (1887)

Acceptance Speech for the Margaret Edwards Award (1998)
Context: Wrinkle, when it was finally published in 1962, after two years of rejections, broke several current taboos. The protagonist was female, and one of the unwritten rules of science fiction was that the protagonist should be male. I'm a female. Why would I give all the best ideas to a male?
Another assumption was that science and fantasy don't mix. Why not? We live in a fantastic universe, and subatomic particles and quantum mechanics are even more fantastic than the macrocosm. Often the only way to look clearly at this extraordinary universe is through fantasy, fairy tale, myth. During the fifties Erich Fromm published a book called The Forgotten Language, in which he said that the only universal language which breaks across barriers of race, culture, time, is the language of fairy tale, fantasy, myth, parable, and that is why the same stories have been around in one form or another for hundreds of years.
Someone said, "It's all been done before."
Yes, I agreed, but we all have to say it in our own voice.

Treasury of Positive Answers

Part 4, Chapter 5.
Books, Coningsby (1844), Contarini Fleming (1832)

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Source: The Great Divorce (1944–1945), Ch. 13
Context: "Ye can know nothing of the end of all things, or nothing expressible in those terms. It may be, as the Lord said to the Lady Julian, that all will be well, and all will be well, and all manner of things will be well. But it's ill talking of such questions."
"Because they are too terrible, Sir?"
"No. Because all answers deceive. If ye put the question from within Time and are asking about possibilities, the answer is certain. The choice of ways is before you. Neither is closed. Any man may choose eternal death. Those who choose it will have it. But if ye are trying to leap on into Eternity, if ye are trying to see the final state of all things as it will be (for so ye must speak) when there are no more possibilities left but only the Real, then ye ask what cannot be answered to mortal ears. Time is the very lens through which ye see — small and clear, as men see through the wrong end of a telescope — something that would otherwise be too big for ye to see at all. That thing is Freedom: the gift whereby ye most resemble your Maker and are yourselves parts of eternal reality. But ye can see it only through the lens of Time, in a little clear picture, through the inverted telescope. It is a picture of moments following one another and yourself in each moment making some choice that might have been otherwise. Neither the temporal succession nor the phantom of what ye might have chosen and didn't is itself Freedom. They are a lens. The picture is a symbol: but it's truer than any philosophical theorem (or, perhaps, than any mystic's vision) that claims to go behind it. For every attempt to see the shape of eternity except through the lens of Time destroys your knowledge of Freedom."

Source: The Laundry Files, The Apocalypse Codex (2012), Chapter 6, “Jet Lag” (p. 110)