Lots of sources credit Anaïs Nin with this, and they agree with each other. The book or the speech it first came from hasn't turned up yet.
What turned up
Only found sourced to French Writers of the Past (2000) by Carol A. Dingle — a posthumous quote-compilation book (Nin died 1977), not a primary Nin work. Held at likely per the posthumous-compilation rule.
Sources checked
en.wikiquote.orgChecked using claude-sonnet-5, 21 August 2026Cites French Writers of the Past (2000), p. 126 — a compilation, not a Nin primary text
Diary of Anais Nin vol. 3 (publ. 1969, in her lifetime) located on archive.org, lending-restricted. Open wording question: diary may print 'in proportion to' vs our 'according to' — unresolved until page-check.
Nothing made from these words yet — Storyfaire is where they get made.
We write to taste life twice, in the moment, and in retrospection.Anaïs Nin