“I live on Earth at present, and I don't know what I am. I know that I am not a category. I am not a thing — a noun. I seem to be a verb, an evolutionary process — an integral function of the universe.”

"Consciousness," trans. Czesław Miłosz and Robert Hass
Unattainable Earth (1986)
Context: I think that I am here, on this earth,
To present a report on it, but to whom I don't know.
As if I were sent so that whatever takes place
Has meaning because it changes into memory.

Source: Wide Awake

Boccioni's quote, from an undated letter to Gino Severini (probably July or August 1912, or November); as quoted in Futurism, ed. Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008.
1912

"Angel Surrounded by Paysans" (1949)
Context: I am one of you and being one of you
Is being and knowing what I am and know.
Yet I am the necessary angel of earth,
Since, in my sight, you see the earth again,
Cleared of its stiff and stubborn, man-locked set
And, in my hearing, you hear its tragic drone
Rise liquidly in liquid lingerings,
Like watery words awash; like meanings said
By repetitions of half-meanings. Am I not,
Myself, only half a figure of a sort,
A figure half seen, or seen for a moment, a man
Of the mind, an apparition appareled in
Apparels of such lightest look that a turn
Of my shoulders and quickly, too quickly, I am gone?

Source: Saturday Night and Sunday Morning

Conversations with a Lady on the Plurality of Worlds or Etretiens sur la Pluralité des Mondes (1686) as quoted by Mark Brake, Alien Life Imagined: Communicating the Science and Culture of Astrobiology (2012)

Lt. Cmdr. Charles E. Madison.
The Americanization of Emily (1964)

A tradition about Taliesin states that he was once a boy named "Gwion".
Book of Taliesin (c. 1275?), The First Address of Taliesin

Source: 1961 - 1980, transcript of a public forum at Boston university', conducted by Joseph Ablow 1966, pp. 73-75