38% sureLots of sources credit Mother Teresa 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
Cited in a Santa Clara University retrospective essay on her peace writings, with no dated primary speech named — weaker sourcing than the other candidates here, but extremely widely and consistently attributed with identical wording.
Work
Widely circulated; cited via a Santa Clara University essay on her peace teaching
Occasion
undated · undated
Sources checked
en.wikiquote.orgChecked using claude-sonnet-5, 21 August 2026Wikiquote 2010s section, same citation
Nothing made from these words yet — Storyfaire is where they get made.