“In writing Newton's biography, I have attempted, in accordance with my understanding of biography as a literary form, to avoid composing an essay on Newtonian science. At the same time I have sought to make Newton the scientist the central character of my drama.”

Se, depois de eu morrer, quiserem escrever a minha biografia,
Não há nada mais simples.
Tem só duas datas—a da minha nascença e a da minha morte.
Entre uma e outra coisa todos os dias são meus.
Alberto Caeiro (heteronym), "Se, depois de eu morrer" (8 November 1915), trans. Jonathan Griffin.
Source: Poems of Fernando Pessoa

"Newton's Principia" in 300 Years of Gravitation. (1987) by S. W. Hawking and W. Israel, p. 4

Official Website (2009)

Khushwant Singh in Sikh Philosophy Network

On Writing Poetry (1995)
Context: It's a feature of our age that if you write a work of fiction, everyone assumes that the people and events in it are disguised biography — but if you write your biography, it's equally assumed you're lying your head off. This last may be true, at any rate of poets: Plato said that poets should be excluded from the ideal republic because they are such liars. I am a poet, and I affirm that this is true. About no subject are poets tempted to lie so much as about their own lives; I know one of them who has floated at least five versions of his autobiography, none of them true. I of course — being also a novelist — am a much more truthful person than that. But since poets lie, how can you believe me?

Source: The Hero With a Thousand Faces

Source: Interview. Portal.ucm.cl

In a letter to Anita Pollitzer, Abiquiu, New Mexico, February 28, 1968); as quoted in The Complete Correspondence of Georgia O’Keeffe & Anita Pollitzer, ed. Clive Giboire, Touchstone Books, Simon & Schuster Inc., New York, 1990, p. 320
1950 - 1970

Acceptance speech of the National Book Award for Nonfiction (1952) for The Sea Around Us; also in Lost Woods: The Discovered Writing of Rachel Carson (1999) edited by Linda Lear, p. 91