Lex Orandi, Lex Credendi

Authority level: Authoritative doctrine
Theological status: Theological synthesis
GuideThe Church authoritatively teaches the correspondence of worship and faith; using liturgical evidence in a doctrinal argument requires theological judgment.
Contents

Lex Orandi, Lex Credendi is the Catholic principle that the Church's rule of prayer and rule of belief correspond: she confesses in public worship the apostolic faith she has received, and that worship forms and witnesses to her belief.

Lex orandi, lex credendi (Latin: "the law of what is prayed [is] the law of what is believed"), sometimes expanded as Lex orandi, lex credendi, lex vivendi (Latin: "the law of what is prayed [is] what is believed [is] the law of what is lived"), is a motto in Christian tradition, which means that prayer and belief are integral to each other and that liturgy is not distinct from theology. It refers to the relationship between worship and belief, for example that people's prayers shape their faith. Its rude applicability as a self-standing principle independent of hope and charity was denied by Pope Pius XII, who positioned liturgy as providing theological evidence not sole authority, although having undeniable divine elements.

Meaning and origin of the maxim

The familiar Latin phrase means the law of praying is the law of believing. It summarizes a line associated with Prosper of Aquitaine: the rule of supplication establishes or confirms the rule of belief. In controversies about grace, the Church's universal intercession provided evidence of what she believed about divine initiative and human need. The principle later became a general expression of the intrinsic relation between liturgy and doctrine.

The relation works in both directions without becoming a contest for priority. The Church celebrates according to the faith received from the apostles, so doctrine judges whether a rite or text is sound. At the same time, authorized and stable worship embodies that faith and can illuminate its content. The liturgy does not merely illustrate ideas already completed elsewhere; Christ acts in sacramental celebration, and the Church confesses the mystery while participating in it.

The Church believes as she prays

The subject of the maxim is the Church, not an individual's spontaneous prayer. Public liturgy is regulated worship offered by Christ's Body through approved rites and ministers. Private devotion can express Catholic belief beautifully but does not possess the same ecclesial standing. An improvised text, local abuse, mistranslation, or isolated historical prayer cannot be treated automatically as the Church's rule of faith.

Doctrinal force of liturgical witness

Baptismal formulas, creeds, Eucharistic prayers, sacramental epicleses, collects, calendars, and rites for the dead have provided major witnesses to Trinitarian, Christological, sacramental, Marian, and eschatological doctrine. Worship can show a belief received across centuries and regions before controversy produced a detailed definition. Repetition in the Church's central acts gives such evidence a weight beyond the private speculation of an author.[1]

Liturgical evidence nevertheless requires interpretation. Poetry compresses meaning; prayers assume doctrines without defining them; rites can develop; translations differ; local uses may not represent the universal Church. The authority of a text depends on approval, purpose, breadth, duration, and relation to other sources. A single phrase cannot be forced to settle every scholastic dispute, while a stable and universal sacramental confession cannot be dismissed as decorative language.

Sacraments of faith

The sacraments presuppose, nourish, strengthen, and express faith. The faith of the Church precedes the faith of the believer invited to adhere to it. This does not make personal faith irrelevant: fruitful reception ordinarily requires conversion and living assent. It means that sacramental validity and the objective confession enacted by the rite do not arise from each minister or congregation inventing belief anew.[2]

Authority, reform, and misuse

Because prayer and belief correspond, competent authority regulates liturgy and excludes texts or actions that obscure doctrine. No priest or community may alter sacramental rites at will. Liturgical reform can clarify the faith, restore sources, adapt language, and serve participation, but it remains bound to sacramental substance and Catholic doctrine. The maxim therefore supports both fidelity to approved books and careful evaluation of reform.[3]

Lex orandi is sometimes misused as though the mere existence of any former rite proved every accompanying opinion irreformable, or as though a new official wording could reverse dogma. Liturgical forms contain divine, apostolic, doctrinal, and disciplinary layers. The Church can reform the changeable layers while preserving the mystery signified. She cannot use worship to contradict revelation, because the authority ordering liturgy serves the same Deposit of Faith.[4]

Ecumenical use

Shared ancient prayers and sacramental forms can reveal substantial common faith among divided Christians and help identify the meaning of early doctrine. Differences in Eucharistic confession, invocation of saints, ordination, or sacramental intention can also disclose real divisions. Liturgical comparison must account for each community's authoritative interpretation and ecclesial status rather than assuming identical words always carry identical doctrine.[5]

Origin

The original maxim is found in 5th Century writer Prosper of Aquitaine's eighth chapter of On the Authority of the Past Bishops of the Apostolic See Concerning the Grace of God and Free Will: "ut legem credendi lex statuat supplicandi."

Let us consider the sacraments of priestly prayers, which having been handed down by the apostles are celebrated uniformly throughout the whole world and in every Catholic Church so that the law of praying might establish the law of believing" (emph. added)

— Prosper of Aquitaine[6]

This section is quoted and ratified by Pope Celestine I in epistle 21, Letter to the Gallican Bishops[7].

"Supplicandi" and “Credendi" are gerunds which are oblique cases of the infinitive, and so can be translated into English as "of praying/believing," or just "of prayer/belief," respectively.

Catholicism

The principle is considered very important in Catholic theology. The Catholic theologian Father Gregory Hesse states:

"The oldest liturgical rule is 'lex orandi, lex credendi', i.e. 'the law of what has to be prayed constitutes the law of what has to be believed (...) Liturgy is a sign of a specific grace received ex operæ operatio"

— A Summary of Father Hesse talks on the documents of Vatican II[8]

Proof not source

In the encyclical Mediator Dei, Pope Pius XII elucidates the limits of this principle and addresses errors that can arise from a misunderstanding of it. He states:

46. [...]We refer to the error and fallacious reasoning of those who have claimed that the sacred liturgy is a kind of proving ground for the truths to be held of faith, meaning by this that the Church is obliged to declare such a doctrine sound when it is found to have produced fruits of piety and sanctity through the sacred rites of the liturgy, and to reject it otherwise. Hence the epigram, "Lex orandi, lex credendi" - the law for prayer is the law for faith.

47. But this is not what the Church teaches and enjoins. The worship she offers to God, all good and great, is a continuous profession of Catholic faith and a continuous exercise of hope and charity, as Augustine puts it tersely. "God is to be worshipped," he says, "by faith, hope and charity." In the sacred liturgy we profess the Catholic faith explicitly and openly, not only by the celebration of the mysteries, and by offering the holy sacrifice and administering the sacraments, but also by saying or singing the credo or Symbol of the faith - it is indeed the sign and badge, as it were, of the Christian - along with other texts, and likewise by the reading of holy scripture, written under the inspiration of the Holy Ghost. The entire liturgy, therefore, has the Catholic faith for its content, inasmuch as it bears public witness to the faith of the Church.

48. For this reason, whenever there was question of defining a truth revealed by God, the Sovereign Pontiff and the Councils in their recourse to the "theological sources," as they are called, have not seldom drawn many an argument from this sacred science of the liturgy.[...]Hence the well-known and venerable maxim, "Legem credendi lex statuat supplicandi" - let the rule for prayer determine the rule of belief. The sacred liturgy, consequently, does not decide or determine independently and of itself what is of Catholic faith. More properly, since the liturgy is also a profession of eternal truths, and subject, as such, to the supreme teaching authority of the Church, it can supply proofs and testimony, quite clearly, of no little value, towards the determination of a particular point of Christian doctrine. But if one desires to differentiate and describe the relationship between faith and the sacred liturgy in absolute and general terms, it is perfectly correct to say, "Lex credendi legem statuat supplicandi" - let the rule of belief determine the rule of prayer. The same holds true for the other theological virtues also, "In . . . fide, spe, caritate continuato desiderio semper oramus" - we pray always, with constant yearning in faith, hope and charity.

— Pope Pius XII (1947)[9]

The inter-relationship of liturgy, belief and life has long been an issue for missionaries, such as the Chinese Rites Controversy, in particular relating to how liturgical and para-liturgical rubrics may need to be selected and localized to suit local sensibilities and meet needs.[10]

Liturgical theology

In the interpretation of liturgical theology many theologians, espoused for example by some Traditionalist Catholics, see liturgy as a result of the organic development of doctrine, as binding, and supported by Mediator Dei, they hold that the divine elements of liturgy cannot be changed by man.[11] The pope states:

50. The sacred liturgy does, in fact, include divine as well as human elements. The former, instituted as they have been by God, cannot be changed in any way by men. But the human components admit of various modifications, as the needs of the age, circumstance and the good of souls may require, and as the ecclesiastical hierarchy, under guidance of the Holy Spirit, may have authorized.

— Pope Pius XII (1947)[12]

In this interpretation, Prosper of Aquitaine's formulation establishes the credence of certain Christian doctrines by placing their source in the Church's authentic liturgical rites, thus describing the liturgy itself as a deposit of extra-Biblical Christian revelation (that is, Apostolic tradition), to which, in addition to Scripture, those who wished to know true doctrine could also refer. It is based on the prayer texts of the Church, that is, the Church's liturgy. In the Early Church, there was liturgical tradition before there was a common creed, and before there was an officially sanctioned biblical canon. These liturgical traditions provided the theological (and doctrinal) framework for establishing the creeds and canon.[11]

Protestantism

According to theologian Mary-Anne Plaatjies-van Huffel, whereas Catholic theology progresses from prayer (both liturgy and supplication) to belief to life: lex orandi, lex credendi, lex vivendi, Protestant theology orders from belief to prayer to life: lex credendi, lex orandi, lex vivendi.[13]

Lutheranism

The principle of lex orandi, lex credendi is found in Lutheranism.[14] Professor of theology J. Matthew Pinson writes that "Liturgical theology shapes the sermon, which in turn gives life to the Liturgy, preventing it from degenerating into dead ritualism, mysticism, or superstition."[15]

Anglicanism

Anglican theology tends to be Augustinian and Reformed with a focus in the worship of the Church, and embodies a strongly evangelical liturgy.[16][17] Thomas Cranmer's reformed liturgy Book of Common Prayer[18] revised the liturgy following a principle of lex orandi, lex credendi to propagate to English congregations the Reformed doctrines of grace and justification by faith alone.[19]

Eastern Churches

Eastern Church's Patriarch Bartholomew I of Constantinople quoted this phrase in Latin on the occasion of the visit of Pope Benedict XVI, drawing from the phrase the lesson that, "in liturgy, we are reminded of the need to reach unity in faith as well as in prayer."[20] Rather than regarding Tradition as something beneath Scripture or parallel to Scripture, Orthodox Christians consider Scripture the culmination and supreme expression of the church's divinely communicated Tradition. Councils and creeds recognized as authoritative are interpreted only as defining and more fully explicating the orthodox faith handed to the apostles, without adding to it.[21]

References

  1. 1.Sacrosanctum Concilium, 5–13, 21–40, and 47–61 — Vatican II on liturgy as the action of Christ and the Church, the doctrinal force of rites and prayers, sacramental worship, regulation, reform, and legitimate diversity
  2. 2.Catechism of the Catholic Church, 1113–1134 — The Church's authoritative teaching on sacraments of faith, the faith of the Church preceding the believer's faith, lex orandi and lex credendi, liturgical Tradition, and regulation of rites
  3. 3.Mediator Dei, 20–23 and 44–61 — Pius XII on public worship by the Mystical Body, the relation of doctrine and liturgy, the maxim concerning the law of prayer and belief, and the Magisterium's authority
  4. 4.International Theological Commission, The Interpretation of Dogma — The International Theological Commission on dogma within the Church's communion, Scripture, Tradition, liturgy as a living theological locus, lex orandi and lex credendi, and renewal from origins
  5. 5.Sacramentum Caritatis, 6–16 and 34–42 — Benedict XVI on lex orandi and lex credendi, Eucharistic faith and celebration, the relationship of mystery believed and celebrated, liturgical form, beauty, and ecclesial communion
  6. 6.Patrologia Latina [Latin Patrology] (in Latin), vol. 51, pp. 209–10,...obsecrationum quoque sacerdotalium sacramenta respiciamus, quae ab apostolis tradita, in toto mundo atque in omni catholica Ecclesia uniformiter celebrantur, ut legem credendi lex statuat supplicandi.
  7. 7.Pope Celestine I. Patrologia Latina (in Latin). Vol. 50. p. 535.
  8. 8.A Summary of Fr. Hesse's talk on the Documents of Vatican II.
  9. 9."Mediator Dei (November 20, 1947) | PIUS XII".
  10. 10.Law, Thomas (Winter 2009). "The 70th Anniversary of Lifting the Ban on the 'Chinese Rites'". Tripod. 155 (2).
  11. 11.[11.2]Geldhof, Joris (January 2010). "Liturgy as Theological Norm Getting Acquainted with 'Liturgical Theology'". Neue Zeitschrift für Systematische Theologie und Religionsphilosophie. 52 (2). doi:10.1515/NZST.2010.010.
  12. 12."Mediator Dei (November 20, 1947) | PIUS XII".
  13. 13.Plaatjies-van Huffel, Mary-Anne (17 August 2020). "Rethinking the reciprocity between lex credendi, lex orandi and lex vivendi: As we believe, so we worship. As we believe, so we live". HTS Teologiese Studies / Theological Studies. 76 (1). doi:10.4102/hts.v76i1.5878.
  14. 14.Lehner, Ulrich L.; Muller, Richard A.; Roeber, A. G. (2016). The Oxford Handbook of Early Modern Theology, 1600-1800. Oxford University Press. p. 344. ISBN 978-0-19-993794-3.
  15. 15.Pinson, J. Matthew (2009). Perspectives on Christian Worship: Five Views. B&H Publishing Group. p. 81. ISBN 978-0-8054-4099-7.
  16. 16.Amos, N. Scott (December 1999). "Martin Bucer and the Revision of the 1549 Book of Common Prayer : Reform of Ceremonies and the Didactic Use of Ritual". Reformation & Renaissance Review. 2 (1): 107–126. doi:10.1179/rrr.1999.2.1.007.
  17. 17.Howell, L, ed. (1662), "Article VI", Thirty-nine Articles, The book of common prayer, Eskimo.
  18. 18.Leuenberger, Samuel (1992), "Archbishop Cranmer's Immortal Bequest: The Book of Common Prayer of the Church of England: An Evangelistic Liturgy" (PDF), Churchman, 106 (1), Church society.
  19. 19."Justification", Reformed Online.
  20. 20.The Feast of Saint Andrew (homily), Ecu. Patriarchate, 30 November 2006, archived from the original on 5 July 2007.
  21. 21."Met. Kallistos (Ware). The Orthodox Church - Chapter 10". readeralexey.narod.ru. Retrieved 8 February 2026.