“Well, what do you know," Pham said. "Butterflies in jackboots.”
Source: A Fire Upon the Deep (1992), Chapter 26 (p. 318).
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Context: Well, first of all, if you’re not—if you’ve never been on a soap box, it’s sort of awkward. You get up on a chair, and you look out—‘specially when the guy will precede you by saying “And the next speaker is Bill Bailey, a member of the Marine Workers Industrial Union, and a great—and this, and on—“, you know. They give you a big razzle-dazzle, and you get up there and you look out over a couple of hundred faces… Nobody’s laughing, no expression, you know, no nothing… You don’t know if they got a ham sandwich in their hand they’re gonna hit you with or what! And you’re supposed to razzle-dazzle them, you know, stir them, you know, really get ‘em up to where they’re screamin’ “Bloody murder!” Well, you know, and you get up there, and you’re mouth is dry, you know. Butterflies in your stomach. I mean, you’re complete emotional, ready to collapse, and the first thing you said to yourself, “I wish an earthquake takes place at this very minute,” you know. But anyway…! Like anything else, you take a deep breath, and you say your first word. And the second one comes out a little bit easier, after you get the word “Fellow-worker”, you know, out of your mouth—that’s the way it is. Then, bit by bit, you start warming up.

Canto X, lines 121–129 (tr. Mandelbaum).
The Divine Comedy (c. 1308–1321), Purgatorio
Context: O Christians, arrogant, exhausted, wretched,
Whose intellects are sick and cannot see,
Who place your confidence in backward steps,
Do you not know that we are worms and born
To form the angelic butterfly that soars,
Without defenses, to confront His judgment?
Why does your mind presume to flight when you
Are still like the imperfect grub, the worm
Before it has attained its final form?

“Do you know what a palmist once said to me? She said: WILL YOU LET GO!”
Sir Henry at Rawlinson End (1978)

As translated by Lin Yutang
Alternative translations
Once upon a time, I, Chuang Chou, dreamt I was a butterfly, fluttering hither and thither, a veritable butterfly, enjoying itself to the full of its bent, and not knowing it was Chuang Chou. Suddenly I awoke, and came to myself, the veritable Chuang Chou. Now I do not know whether it was then I dreamt I was a butterfly, or whether I am now a butterfly dreaming I am a man. Between me and the butterfly there must be a difference. This is an instance of transformation.
As translated by James Legge, and quoted in The Three Religions of China: Lectures Delivered at Oxford (1913) by William Edward Soothill, p. 75
Once Zhuang Zhou dreamed he was a butterfly, a fluttering butterfly. What fun he had, doing as he pleased! He did not know he was Zhou. Suddenly he woke up and found himself to be Zhou. He did not know whether Zhou had dreamed he was a butterfly or a butterfly had dreamed he was Zhou. Between Zhou and the butterfly there must be some distinction. This is what is meant by the transformation of things.
One night, Zhuangzi dreamed of being a butterfly — a happy butterfly, showing off and doing things as he pleased, unaware of being Zhuangzi. Suddenly he awoke, drowsily, Zhuangzi again. And he could not tell whether it was Zhuangzi who had dreamt the butterfly or the butterfly dreaming Zhuangzi. But there must be some difference between them! This is called 'the transformation of things'.
Once upon a time, Chuang Chou dreamed that he was a butterfly, a butterfly flitting about happily enjoying himself. He didn’t know that he was Chou. Suddenly he awoke and was palpably Chou. He didn’t know whether he were Chou who had dreamed of being a butterfly, or a butterfly who was dreaming that he was Chou.
Context: Once upon a time, I, Chuang Chou, dreamt I was a butterfly, fluttering hither and thither, to all intents and purposes a butterfly. I was conscious only of my happiness as a butterfly, unaware that I was Chou. Soon I awaked, and there I was, veritably myself again. Now I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly, dreaming I am a man. Between a man and a butterfly there is necessarily a distinction. The transition is called the transformation of material things.

Dhani Harrison " Jeff Lynne & Dhani Harrison interview Part three https://youtube.com/watch?v=B48tHi-l4PQ" at Youtube.com, 2002: Interview with Jeff Lynne & Dhani Harrison about George Harrison and his Brainwashed album.2002