“Any life, however long and complicated it may be, actually consists of a single moment — the moment when a man knows forever more who he is.”
"A Biography of Tadeo Isidoro Cruz", in The Aleph (1949); tr. Andrew Hurley, Collected Fictions (1998)
Variant: Any life, no matter how long and complex it may be, is made up of a single moment — the moment in which a man finds out, once and for all, who he is.
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Jorge Luis Borges 213
Argentine short-story writer, essayist, poet and translator… 1899–1986Related quotes

Hagakure (c. 1716)
Source: Hagakure: The Book of the Samurai
Context: There is surely nothing other than the single purpose of the present moment. A man's whole life is a succession of moment after moment. If one fully understands the present moment, there will be nothing else to do, and nothing else to pursue. Live being true to the single purpose of the moment.
Everyone lets the present moment slip by, then looks for it as though he thought it were somewhere else.

Anticipation (2008)

“Every life has moments that change us forever and make us who we are.”
Source: Apples and Oranges https://www.litlovers.com/reading-guides/non-fiction/79-apples-a-oranges-brenner?start=3
A Voice from the Attic (1960)

Letter to Gerrit Smith, (Feb. 7, 1835), The Letters of William Lloyd Garrison, vol. 1, Walter M. Merrill, edit., Belknap Press-Harvard University Press, 1971, p. 445

Often referred to as Anderson's Law.
Cited in:
Project Management: A Systems Approach to Planning, Scheduling, and Controlling by Harold Kerzner. Google Books http://books.google.com/books?id=4CqvpWwMLVEC&pg=PA246. Accessed September 5, 2009.
Checkland, P.B. (1985). Formulating problems in Systems Analysis. In: Miser, H. J. and Quade E. S. (eds.) (1985). Handbook of Systems Analysis: Overview of Uses, Procedures, Applications, and Practice. Chapter 5, pp. 151-170. North-Holland, New York.
Attributed
Knowing Yourself: The True in the False (1996)