This exact wording appears in no work of Thomas Aquinas and is absent from Wikiquote’s Aquinas page. The saying is fundamentally anonymous — the earliest known instance is an 1882 St. Louis Post-Dispatch editorial (“No explanation is needed for a believer; no explanation suffices for an unbeliever”) — and its famous modern form is the prologue of the 1943 film ‘The Song of Bernadette,’ written by screenwriter George Seaton. The Aquinas credit is a later, unsupported misattribution.
“To one who has faith, no explanation is necessary. To one without faith, no explanation is possible” Anonymous aphorism (documented by 1882; popularized by the 1943 film The Song of Bernadette) — often misattributed to Thomas Aquinas
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In context
Evoking the world of Anonymous — popularized by the 1943 film The Song of Bernadette. Theme: "To one who has faith, no explanation is necessary. To one without faith, no explanation is possible". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.
Minimalist
Minimalist editorial slide for the quote "To one who has faith, no explanation is necessary. To one without faith, no explanation is possible". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.
Provenance
The source
Popularly credited to
Thomas Aquinas (unsupported)
Actually
Anonymous aphorism; popularized by the 1943 film
Famous source
The Song of Bernadette (1943 film prologue)
Earliest known
St. Louis Post-Dispatch, 1882 (anonymous)
For those who believe in God, no explanation is necessary. For those who do not believe in God, no explanation is possible.
Misattributed
The verbatim on-screen prologue of the 1943 film ‘The Song of Bernadette’ (screenplay by George Seaton), as transcribed by the AFI Catalog. The Aquinas-credited version simply swaps “believe in God” for “has faith” / “without faith.”
Earliest documented form: an 1882 St. Louis Post-Dispatch editorial — “No explanation is needed for a believer; no explanation suffices for an unbeliever” — with no author named, per Quote Investigator.
The famous modern wording is the on-screen prologue of the 1943 film, written by George Seaton: “For those who believe in God, no explanation is necessary…” — transcribed in the AFI Catalog.
The line is not attested for Thomas Aquinas — it appears nowhere on his Wikiquote page, and even the Werfel credit is filed under “Disputed” on Wikiquote’s Werfel page.
This exact English wording (“To one who has faith… To one without faith…”) is an anonymous modern variant with no identifiable author or first-publication record. The underlying aphorism’s 1882 form is old enough to be public-domain, but that is different wording; the widely quoted 1943 film prologue is a distinct, identifiable variant (George Seaton / Twentieth Century-Fox). Because the origin of this specific phrasing cannot be pinned down, we assert no copyright status.
Fact-check
A quote with many claimants — but not Aquinas
This is a genuinely wandering aphorism. It has been pinned on several people over 140 years; Thomas Aquinas is one of the least supported of them.
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This exact wordingThomas Aquinas Misattributed
The line appears in no work of Aquinas and is absent from his Wikiquote page entirely. Aquinas did write about faith and reason, but this modern one-liner is not a translation or paraphrase of any identified passage of his.
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The famous modern formFranz Werfel / The Song of Bernadette Popularized, not authored
The wording most people know is the 1943 film’s prologue, written by screenwriter George Seaton; Quote Investigator checked Werfel’s 1942 novel and found the saying is not in it.
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Rival claimantsFather John LaFarge, Bishop Charles Brent, Ignatius of Loyola Disputed
LaFarge claimed authorship in his 1954 memoir and the line was credited to Bishop Brent as early as 1940; it is also loosely attached to Ignatius of Loyola on Wikiquote. None predate the anonymous 1882 printing.
✓The honest verdict: an anonymous aphorism documented by 1882 and made famous by the 1943 film The Song of Bernadette — not Thomas Aquinas.
Context
Why it sticks to Aquinas
The aphorism’s neat chiasmus — belief needs no proof, unbelief accepts none — reads like medieval scholastic theology, so it drifts naturally toward the most famous theologian of faith-and-reason. But its documented life is modern and popular, not scholastic: a newspaper editorial, a bestselling novel about Lourdes, and above all a much-loved 1943 film whose very first words are this line.
Because the film presented the sentence with no author, it became free-floating — and quote sites in the internet era supplied a prestigious name. Aquinas, Werfel, LaFarge, Brent and Ignatius have all been offered; the only defensible answer is that no one can be shown to have coined it.
Belief needs no proof; unbelief accepts none — a line everyone quotes and no one can claim.
The dated citation trail
1882 — St. Louis Post-Dispatch prints the earliest known form, anonymously.
1940 — a private publication credits Bishop Charles Brent; 1943 — the film ‘The Song of Bernadette’ opens with the saying, unattributed.
1954 — Father John LaFarge claims authorship in his memoir; the Aquinas credit is a still-later internet-era development.
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Provenance
Where the saying actually comes from
AN
Anonymous
Aphorism documented by 1882 · popularized by the 1943 film The Song of Bernadette
This saying about faith and explanation has no single documented author. Its earliest known appearance is an anonymous 1882 St. Louis Post-Dispatch editorial; over the decades it was variously claimed by or credited to Father John LaFarge, Bishop Charles Brent, and others, and also floated as a line of Ignatius of Loyola. Its best-known modern form is the on-screen prologue of the 1943 film The Song of Bernadette, adapted from Franz Werfel’s novel by screenwriter George Seaton — though the phrase does not actually appear in Werfel’s book. The attribution to Thomas Aquinas is a still later, unsupported reassignment.
For writers & researchers
Cite this
Primary tracing
Garson O’Toole, “No Explanation Is Needed for a Believer; No Explanation Suffices for an Unbeliever,” Quote Investigator, 7 Aug 2020; earliest documented instance in St. Louis Post-Dispatch, 1882 (anonymous); popular form in The Song of Bernadette (dir. Henry King, screenplay George Seaton, Twentieth Century-Fox, 1943).
This verification page
Quotle.info. “Who really said ‘To one who has faith, no explanation is necessary. To one without faith, no explanation is possible’?” Last verified 8 Jul 2026. https://quotle.info/who-said/to-one-who-has-faith-no-explanation-is-necessary-to-one