Marriage

The Catechism opens its exposition with a definition that serves as the compass for all the rest:

"The matrimonial covenant, by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring, has been raised by Christ the Lord to the dignity of a sacrament between the baptized." — Catechism of the Catholic Church, § 1601^[6]

A natural reality raised to the dignity of a sacrament

Marriage is not an invention of the Church, nor a purely cultural convention. It belongs to what theology calls the natural law: the stable and fruitful union of man and woman is found, in various forms, in every civilization, because it is inscribed in the very nature of the person created "male and female" (Gen 1:27)^[7]. The Second Vatican Council describes it as an "intimate partnership of married life and love", established by the Creator and qualified by his laws, which is rooted in the irrevocable personal consent of the spouses^[8].

Christ therefore did not create marriage: he found it wounded by sin and restored it to its original purity, then raised it to the dignity of a sacrament of the New Covenant. That is why the marriage of the baptized is both fully human — a bond of love, commitment and fruitfulness — and fully supernatural: a channel of Christ's grace^[9].

Natural marriage and sacramental marriage

The distinction is crucial and often ignored. Between two unbaptized persons, or between a baptized and an unbaptized person, there exists a true natural marriage, valid and binding before God. But marriage as a sacrament in the strict sense exists only between two baptized persons: for them, the Church teaches that there is identity between the contract and the sacrament — that is, a validly contracted marriage between two baptized persons is, by that very fact, a sacrament; there is no purely "civil" marriage that would afterwards be sacramentalized by a blessing^[10]. Leo XIII affirmed this against the partisans of purely civil marriage:

"Between Christians there can be no true marriage which is not by that very fact a sacrament." — Leo XIII, encyclical Arcanum Divinae Sapientiae, 10 February 1880^[11]

Its place among the seven sacraments

Marriage is ranked, in classical theology, among the sacraments at the service of communion: it does not aim first at the personal salvation of the one who receives it, but at the building up of the People of God through self-gift to spouse and children^[12]. Like Baptism and Confirmation, it presupposes faith and the state of grace to be received fruitfully; but, unlike the Eucharist or Confession which are received many times, its bond is perpetual: it cannot be contracted anew while one's spouse is alive (widowhood, on the other hand, makes a new marriage possible). Its validity, like that of every sacrament, depends on a matter, a form, a minister and the required intention — four elements treated by the companion articles The validity of the sacraments, Matter and form, Ordinary and extraordinary ministers and The minister's intention.

Catholic doctrine on marriage does not rest on an isolated verse, but on a continuous biblical thread running from creation to the Kingdom. Scripture presents the union of man and woman as God's first gift and as the privileged image of his covenant with his people.

In the beginning: institution in creation

The first two chapters of Genesis lay the foundation of the whole theology of marriage. God creates man "in his own image [...] male and female he created them" (Gen 1:27) and entrusts fruitfulness to them: "Be fruitful and multiply" (Gen 1:28)^[13]. The second account stresses complementarity and unity:

"Therefore a man leaves his father and his mother and cleaves to his wife, and they become one flesh." — Genesis 2:24^[14]

This "one flesh" is the key to all that follows: it speaks of the unity of the couple, indissoluble, prior to sin, willed by the Creator himself. The Catechism sees in it the foundation of the unity and indissolubility of marriage^[15].

Christ restores the original design

Questioned about the repudiation Moses had tolerated, Jesus refers precisely to this design of the origins. The Catechism summarizes:

"In his preaching Jesus taught the original meaning of the union of man and woman as the Creator willed it from the beginning." — Catechism of the Catholic Church, § 1614^[16]

To those who invoke Moses, Christ opposes the first divine intention and draws the consequence:

"What therefore God has joined together, let not man put asunder." — Jesus, according to Matthew 19:6^[17]

The Mosaic tolerance of repudiation was a concession "for your hardness of heart"; "but from the beginning it was not so" (Mt 19:8). Jesus thus restores original indissolubility, developed further in the article What does the Church say about sacramental marriage?.

The wedding at Cana: the first sign

It is no coincidence that Jesus' first public miracle, "the first of his signs", takes place at a wedding feast (Jn 2:1-11)^[18]. The Church's tradition has always seen in it a confirmation of the goodness of marriage and the announcement of its transformation: at Cana, the water changed into wine prefigures the new grace with which Christ will fill the union of spouses^[19]. Saint John places this sign at the threshold of the whole Gospel, as if to say that Christ's work opens with a wedding and will be completed at the "marriage of the Lamb" (Rev 19:9).

The great mystery: Christ and the Church

It is Saint Paul who reveals the deepest meaning of Christian marriage. Taking up Gen 2:24, he reads in it the image of the union of Christ and the Church:

"'For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one.' This is a great mystery, and I mean in reference to Christ and the Church." — Saint Paul, Letter to the Ephesians 5:31-32^[20]

Marriage thus becomes a sacred sign: the faithful, total and fruitful love of spouses makes visible the love with which Christ gave himself for his Church. The Catechism draws from this the dignity proper to the sacrament: "The entire Christian life bears the mark of the spousal love of Christ and the Church"^[21]. That is why infidelity, divorce or the refusal of fruitfulness are not only human failings: they disfigure a sign of the Covenant.

Saint Paul's teaching on fidelity

To the Corinthians, Paul hands on, not as an opinion but as a precept of the Lord, the prohibition against breaking the bond:

"To the married I give charge, not I but the Lord: that the wife should not separate from her husband [...] and that the husband should not divorce his wife." — Saint Paul, First Letter to the Corinthians 7:10-11^[22]

Paul also recognizes the value of marriage as a path of holiness, distinct but not inferior in dignity to consecrated celibacy: each receives "his own gift" (1 Cor 7:7). Marriage and celibacy are therefore not opposed — they are two complementary vocations, as detailed in How to discern one's vocation?.

If marriage exists from creation, its sacramental dignity was recognized and defined progressively by the Church, as theological reflection matured and as objections — Gnostic, Cathar, then Protestant — compelled her to state her faith precisely.

The teaching of the Fathers and medieval theology

From the earliest centuries, the Fathers defended the goodness of marriage against currents that despised the body and procreation (Gnostics, Manicheans, Encratites). Saint Augustine (354-430) forged the decisive doctrine of the three goods of marriage — offspring, fidelity and the sacred character of the bond — which would structure all Western theology^[23]. In the 12th and 13th centuries, Peter Lombard and then Saint Thomas Aquinas firmly integrated marriage into the list of the seven sacraments, analyzing its sign, its matter and its form^[24]. Against the Cathars, who condemned marriage as an evil work, the Council of Verona (1184) and the Fourth Lateran Council (1215) reaffirmed its holiness.

Florence and Trent: the dogmatic definitions

The Council of Florence, in the Decree for the Armenians (1439), officially enumerates marriage among the seven sacraments and takes up the Augustinian doctrine of the three goods, specifying that the efficient cause of marriage is ordinarily the mutual consent expressed in words of the present^[25].

Faced with the Protestant reformers — who denied the sacramentality of marriage and admitted divorce — the Council of Trent ruled solemnly at its Session XXIV (11 November 1563). Its first canon defines as dogma that marriage is "truly and properly one of the seven sacraments of the Law of the Gospel, instituted by Christ the Lord", with an anathema against whoever denies it^[26]. Its seventh canon defines indissolubility: the bond is broken neither by adultery nor by any other cause, and the Church does not err in teaching so^[27]. The same council, through the decree Tametsi, imposed for the first time a mandatory canonical form (exchange of consent before the parish priest and two witnesses) to put an end to clandestine marriages^[28].

Every sacrament is a sensible sign instituted by Christ to signify and produce grace. For marriage, this sign has a particular structure that distinguishes it from the six others and makes it a textbook case for the theology of matter and form.

Consent, the heart of the sacrament

What "makes" marriage is neither consummation, nor the blessing, nor the celebration: it is the consent of the spouses — the act of the will by which "a man and a woman mutually give and accept each other"^[29]. The Code is categorical:

"A marriage is brought into being by the lawfully manifested consent of persons who are legally capable. This consent cannot be supplied by any human power." — Code of Canon Law (1983), canon 1057 § 1^[30]

From this follows an immense consequence: a marriage is valid or null according to the quality of the consent given on the wedding day. That is why nullity procedures always examine, not the couple's later failure, but the existence of a true consent at the origin.

Who are the ministers of the sacrament?

This is where marriage is unique. In the Latin tradition, the ministers are not the priest or deacon, but the spouses themselves:

"In the Latin Church, it is ordinarily understood that the spouses, as ministers of Christ's grace, mutually confer upon each other the sacrament of Matrimony by expressing their consent before the Church." — Catechism of the Catholic Church, § 1623^[31]

The priest or deacon therefore does not "administer" the sacrament in the proper sense: he receives the spouses' consent in the name of the Church and gives the blessing. He is the qualified witness whose presence guarantees the validity of the canonical form. This particularity sheds light on the companion articles Ordinary and extraordinary ministers and The minister's intention: in marriage, the intention to "do what the Church does" is required of the spouses themselves. The Eastern tradition presents things differently: it sees in the priest, through the prayer of crowning (stephanosis), the minister who blesses and seals the union — without denying the role of consent.

Matter and form of marriage

How is the classical "matter and form" framework applied to marriage? Theology debated the question at length, and the most commonly accepted answer is an elegant one: consent is both the matter and the form of the sacrament. More precisely, the matter is the mutual gift the spouses make of themselves (the reciprocal handing over of rights over their person with a view to the conjugal community), and the form is the mutual acceptance of this gift, expressed by the words or signs of consent^[32]. The words "I take you as my wife / as my husband" thus carry both the matter (what is given) and the form (the acceptance that specifies it). For the baptized, this human sign is, by Christ's institution, the vehicle of sacramental grace.

The canonical form: before whom does one marry?

Since Trent's Tametsi decree (1563), confirmed by the 1983 Code, Catholics are bound to a canonical form: to be valid, their marriage must normally be celebrated "before the local Ordinary or pastor or a priest or deacon delegated by either of them who assist, as well as before two witnesses"^[33]. This requirement is not bureaucratic red tape: it protects the public and ecclesial character of marriage, prevents clandestine unions and guarantees that consent was truly exchanged. A Catholic who marries without this form, and without a dispensation, contracts an invalid marriage — an essential point for understanding certain declarations of nullity for "lack of form".

Like every sacrament, marriage effects what it signifies. Its effects are of two orders: an objective bond and an interior grace.

The matrimonial bond

From valid consent there immediately arises a reality that no longer depends on the spouses' will:

"From a valid marriage there arises between the spouses a bond which by its very nature is perpetual and exclusive; furthermore, in a Christian marriage the spouses are strengthened and as it were consecrated for the duties and dignity of their state by a special sacrament." — Catechism of the Catholic Church, § 1638^[34]

This bond is sealed by God himself: "The consent by which the spouses mutually give and receive one another is sealed by God himself", so that "a marriage concluded and consummated between the baptized can never be dissolved"^[35]. The law draws from this the densest norm in all the Church's legislation:

"A marriage that is ratified and consummated cannot be dissolved by any human power or for any reason other than death." — Code of Canon Law (1983), canon 1141^[36]

It is this bond — and not the couple's emotional state — that remains even when common life becomes impossible. The Church may then admit a separation while the bond remains, but the bond subsists^[37].

The grace proper to the sacrament

Marriage is not just a juridical status: it gives a specific grace, fitted to the life of spouses.

"This grace proper to the sacrament of Matrimony is intended to perfect the love of the spouses, to strengthen their indissoluble unity. By this grace, 'they help one another to attain holiness in their married life.'" — Catechism of the Catholic Church, § 1641^[38]

The source of this grace is Christ himself: "Christ is the source of this grace", he who "remains with them" and gives them strength "to take up their crosses and so follow him"^[39]. Concretely, this grace sustains fidelity over time, makes patience and mutual forgiveness fruitful, and turns the home into a "domestic church"^[40]. The sacrament of marriage is therefore not received only on the wedding day: it is a permanent grace, on which spouses draw every day.

To describe what marriage is ordered to, the Church has inherited from Saint Augustine a threefold analysis — the goods — and formulates in modern terms the ends of the union.

The three goods according to Saint Augustine

Augustine sums up the goodness of marriage in three words, taken up by all subsequent teaching and solemnly quoted by Pius XI:

"These are all the goods which make marriage good: offspring, conjugal fidelity, the sacrament." — Saint Augustine, quoted by Pius XI, encyclical Casti Connubii, 31 December 1930^[41]

The following table clarifies their meaning. It reads as follows: each "good" designates both a value that marriage protects and a duty it entails.

How to read the table: these three goods are not external conditions, but the internal dimensions of every true marriage. To exclude them positively by an act of the will at the moment of consent makes the marriage null — for example by refusing from the outset all fidelity, all fruitfulness, or by reserving the right to divorce.

The two inseparable ends

Contemporary language, taken up by the Code and by Vatican II, speaks of two ends ordered to each other: the good of the spouses (bonum coniugum) and the procreation and education of children^[42]. Long presented hierarchically (a "primary" and a "secondary" end), they are today affirmed as inseparable: the love of spouses is ordered to life, and the transmission of life flourishes within love. It is this unity that the Church's teaching on birth regulation protects, developed in What does the Church say about contraception?: one may not voluntarily separate the two meanings of the conjugal act, unitive and procreative, without wounding marriage itself.

Canon 1056 states: "The essential properties of marriage are unity and indissolubility, which in Christian marriage obtain a special firmness by reason of the sacrament"^[43]. These two properties are not optional ideals: they belong to the essence of marriage, and their voluntary exclusion makes it null.

Unity: one man, one woman

Unity excludes polygamy. Because marriage makes the two spouses "one flesh" (Gen 2:24) and because it signifies the union of Christ with the one Church, it can unite only one man and one woman^[44]. The Old Testament tolerated the polygamy of the patriarchs; but, like repudiation, this was a concession to hardness of heart, and "from the beginning it was not so". Christ restores original monogamy as the absolute norm.

Indissolubility: what God has joined

Indissolubility means that the matrimonial bond lasts until death: no human power can break it. It follows directly from Christ's word ("let not man put asunder", Mt 19:6) and was defined as dogma by Trent's canon 7^[45]. The complete argument, the objections and the pastoral care of painful situations are developed in the dedicated article What does the Church say about sacramental marriage? and, for the divorced and remarried, in May a divorced and remarried person receive Communion?.

Marriage "ratified and consummated": absolute indissolubility

The law distinguishes degrees of indissolubility according to whether the marriage is merely ratified (ratum: validly concluded between baptized persons but not consummated) or ratified and consummated (ratum et consummatum). A merely ratified marriage can, in rare cases, be dissolved by the Pope (dissolution super rato) or by solemn religious profession. But a valid and consummated sacramental marriage is absolutely indissoluble: "by no human power and for no cause, except death" can it be undone (can. 1141)^[46]. This is the summit of indissolubility, because it fully realizes the image of the irrevocable union of Christ and the Church.

For a marriage to be valid, three conditions must be met: a true consent, the capacity of the contracting parties (absence of impediment), and observance of the canonical form. Failure in any one of the three makes the marriage null — that is, non-existent from the origin, which is the object of a declaration of nullity.

Free and informed consent

Consent must be free (without constraint or grave fear), informed (without error concerning the person or an essential quality), and complete (without exclusion of an essential property or good of marriage). Null, for example: a marriage extorted by fear; one in which a spouse excludes fidelity or fruitfulness from the outset ("simulation"); or one contracted by a person incapable of assuming the essential obligations for a grave psychic cause^[47]. Consent is a personal and present act: one cannot marry by proxy without a special mandate, nor "to see how it goes".

Diriment impediments

The Code enumerates twelve diriment impediments that render a person incapable of contracting validly, until a dispensation is granted. The table below presents them: it must be read as the list of situations in which, even with perfect consent, the marriage would be null.

Several of these impediments (disparity of cult, distant collateral consanguinity, age...) are dispensable by the competent authority; others, like the prior bond, never are while the first bond subsists.

When is a marriage null?

A declaration of nullity is not a "Catholic divorce". It establishes that, by reason of a defect of consent, an impediment or a defect of form, there never was a valid sacramental marriage, despite appearances. The whole procedure, its grounds and Pope Francis's 2015 reforms are set out in What does the Church say about annulment?.

Not all marriages bring together two baptized persons. The Church has developed a nuanced law for unions involving a non-Christian or a non-Catholic Christian.

Mixed marriages and disparity of cult

A mixed marriage is the union of a Catholic with a baptized non-Catholic (Orthodox, Protestant), and disparity of cult the union of a Catholic with an unbaptized person. The former requires a permission, the latter a dispensation from the impediment (can. 1086): in both cases, the Catholic party must promise to keep the faith and to do everything possible so that the children are baptized and raised in the Catholic Church^[48]. A marriage between a Catholic and an unbaptized person, validly dispensed, is a true natural marriage, but not a sacrament, since both parties are not baptized.

The Pauline privilege and the Petrine privilege

To protect the faith of the converted spouse, the Church knows two exceptional dissolutions of a non-sacramental marriage. The Pauline privilege (founded on 1 Cor 7:12-15) allows the dissolution of the marriage of two unbaptized persons when one converts and receives baptism, if the other refuses peaceful common life^[49]. The Petrine privilege (or "privilege of the faith") designates the dissolution, granted by the Pope, of a marriage between a baptized and an unbaptized person, in favour of the faith. These provisions do not contradict indissolubility: they never touch a consummated sacramental marriage, which remains absolutely indissoluble.

The marriage of Christians, because it is an act of worship and a public sign, is celebrated in the liturgy of the Church.

The Latin rite

In the Latin Church, marriage is ordinarily celebrated in the course of Mass, because of the bond between every sacrament and Christ's paschal mystery^[50]. The heart of the rite is the exchange of consent, received by the priest or deacon in the name of the Church, followed by the nuptial blessing and the giving of the rings, a sign of fidelity. The Eucharistic celebration surrounding it manifests that spouses seal their gift within the gift Christ makes of himself.

The Eastern tradition and crowning

The Eastern Catholic Churches celebrate marriage through the rite of crowning (stephanosis): the spouses receive crowns upon their heads, a sign of the grace of the Holy Spirit and of the royal dignity of their union, "like martyrs" called to a love that gives itself^[51]. This diversity of rites expresses one and the same faith: it is always Christ who, through the Spirit, seals the spouses' covenant.

Christian marriage is today contested from without and weakened from within. The Church does not answer with discouragement, but by recalling the greatness of the sacrament and the grace that accompanies it.

Marriage and openness to life

Because fruitfulness (proles) is an essential good, the Church teaches that spouses may not voluntarily separate the two meanings of the conjugal act, union and procreation. This founds her teaching on the natural regulation of births and her refusal of artificial contraception (see What does the Church say about contraception?) as of in vitro fertilization, which dissociates procreation from the spouses' union. This is not contempt for the desire for children, but a defence of the logic of gift that structures marriage.

Divorce and new unions

Civil divorce does not break the sacramental bond: in the eyes of the Church, the validly married spouse remains bound. This explains the often painful situation of the divorced and remarried, to whom the Church offers a path of accompaniment detailed in May a divorced and remarried person receive Communion?. Far from a condemnation, this discipline is the reverse side of good news: the bond God has tied is stronger than human failings.

"Marriage" between persons of the same sex

Because marriage is by nature the union of a man and a woman (can. 1055) ordered to fruitfulness, the Church cannot recognize as marriage a union between two persons of the same sex: this is not a judgment on persons, but on the objective nature of the institution as the Creator willed it. This question, which also concerns the respect owed to every person, is treated more broadly in Is the Church homophobic?.

A vocation to holiness

The sacrament of marriage is, as Vatican II recalls, a true path of holiness: spouses "help one another to attain holiness" (CCC 1641) and become, through their faithful and fruitful love, a living sign of the Gospel. The home is called to be a "domestic church", the first place where faith is handed on and charity learned^[52]. The grace of the sacrament, received once but always active, is the strength that makes possible what exceeds merely human resources: to love "as Christ loved the Church" (Eph 5:25).

• Marriage is one of the seven sacraments: a natural reality, willed by the Creator, which Christ restored and raised to the dignity of an efficacious sign of grace^[53].
• Between two baptized persons, contract and sacrament are inseparable: every true Christian marriage is, by that very fact, a sacrament^[54].
• What makes marriage is the consent of the spouses; they are, in the Latin tradition, its ministers, the priest or deacon being the Church's qualified witness^[55].
• The sacrament produces a perpetual and exclusive bond sealed by God, and a proper grace that perfects the spouses' love and sanctifies them^[56][57].
• Its goods (children, fidelity, the sacred character) and its properties (unity and indissolubility) belong to its essence; to exclude them voluntarily makes the marriage null.
• A valid and consummated sacramental marriage is absolutely indissoluble: no human power can break it^[58].

• What does the Church say about sacramental marriage? — why Christian marriage is indissoluble.
• What does the Church say about annulment? — the declaration of nullity, its grounds and procedure.
• May a divorced and remarried person receive Communion? — Eucharistic discipline and the paths offered.
• How to discern one's vocation? — marriage, priesthood, consecrated life.
• What does the Church say about contraception? — openness to life and birth regulation.
• Baptism · The Eucharist · Holy Orders — the other sacraments.
• The 1983 Code of Canon Law — the law of marriage (canons 1055-1165).