55% sureLots of sources credit Audrey Hepburn 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
Attributed; sourced only to How to Be Lovely (Melissa Hellstern, 2005) — a posthumous compilation, so held at likely (no lifetime publication located this pass).
Work
collected in How to Be Lovely: The Audrey Hepburn Way of Life (Melissa Hellstern, 2005)
Occasion
talking about what she loved most in the people around her
Sources checked
en.wikiquote.orgChecked using claude-fable-5, 22 August 2026Wikiquote quotes it from Hellstern's How to Be Lovely (2005) — posthumous compilation class, not verified-grade. The circulating form continues '...It cures a multitude of ills'; stored text is Wikiquote's rendering, complete sentences, continuation elaborates without reversal.