The Church is not a club of the like-minded, nor merely an institution with officers and rules. She is, in the constant teaching of Scripture and Tradition, a living Body — the Mystical Body of Christ, of which He is the Head, the Holy Ghost the soul, and the baptized the members. As Pope Pius XII taught in Mystici Corporis Christi (1943), the encyclical that gathered this whole doctrine into one, if we would define the true Church of Jesus Christ, “we shall find nothing more noble, more sublime, or more divine than the expression ‘the Mystical Body of Christ.’”
And this Body is greater than what the eye sees. Death does not amputate its members: those who die in Christ remain in Christ. Hence the one Church exists at once in three states — triumphant in heaven, suffering in purgatory, militant (that is, fighting) on earth — bound together in the ninth article of the Creed as the Communion of Saints. No Catholic prays alone, suffers alone, or is saved alone.
Fundamenta
The Doctrine in Scripture
The teaching is St. Paul's great theme, but its root is in Our Lord's own words. On the road to Damascus, Christ did not ask Saul, “Why persecutest thou my followers?” but “Saul, Saul, why persecutest thou me?” (Acts 9:4) — identifying Himself with His Church so completely that to strike her is to strike Him. The same identity breathes in the parable of the vine: “I am the vine; you the branches” (John 15:5) — one life circulating from stock to shoot.
St. Paul unfolds it: as the human body is one and has many members, so also is Christ (1 Cor. 12:12); we, being many, are “one body in Christ, and every one members one of another” (Rom. 12:5); God “hath made him head over all the church, which is his body” (Eph. 1:22–23); “he is the head of the body, the church” (Col. 1:18). From the Head, the whole body, “compacted and fitly joined together,” grows and builds itself up in charity (Eph. 4:15–16). Because the members share one life, they share one lot: “if one member suffer any thing, all the members suffer with it; or if one member glory, all the members rejoice with it” (1 Cor. 12:26). That single verse is the whole doctrine of the Communion of Saints in miniature.
Corpus Mysticum
Why “Mystical”?
The word does not mean vague or metaphorical. It marks off this Body from two others that are Christ's, and from every merely human society:
Not His Physical Body
The natural Body born of the Virgin, crucified, risen, and now glorified at the Father's right hand.
Not His Eucharistic Body
That same true Body, really present under the appearances of bread and wine — which, received in Communion, builds up the Mystical Body.
More Than a Moral Body
A nation or society is united only by a common purpose. The Church is united from within, by a divine Person — the Holy Ghost — dwelling in Head and members alike.
Pius XII draws the consequence: because her bond is the indwelling Spirit and not mere agreement, the Church is a living organism, not an organization only. Leo XIII put the two truths in one sentence: as Christ is the Head of the Church, the Holy Ghost is her soul (Divinum Illud Munus, 1897). And St. Augustine dared the doctrine's boldest word: since Head and members form one Christ — totus Christus, the whole Christ — the Church is, in a true sense, Christ Himself continued in the world.
Who belongs to this Body? By baptism a man is really incorporated into Christ; Mystici Corporis teaches that members in the full sense are those who are baptized, profess the true faith, and remain in the Church's communion — while grave sin, though it kills the life of grace in a member, does not of itself sever him from the Body, as a withered branch may still hang on the vine. Those outside her visible communion the Church commends to God's mercy and, where they are joined to her by baptism and good faith, recognizes as truly, though imperfectly, related to the one Body. She judges dispositions charitably; the doctrine itself she cannot dilute: there is one Body, as there is one Head.
Una Ecclesia · Tres Status
One Body, Three States
The Catechism of the Council of Trent teaches that the Church has “two parts, the one triumphant, the other militant,” with the suffering souls belonging to her as well; the traditional catechesis names all three. They are not three Churches but one, as a kingdom is one though some of its citizens are home in the capital, some on the road, and some still in the field. Between the three states runs a ceaseless commerce of grace:
Christ the Head
“He is the head of the body, the church… that in all things he may hold the primacy.” — Col. 1:18
The Holy Ghost, the Soul of the whole Body, vivifying every member in every state
↓ grace, headship, merit
The Church Triumphant
Ecclesia Triumphans · the saints in heaven
Those who see God face to face in the beatific vision. Their warfare is accomplished; they reign with Christ and intercede for their brethren below.
↓ intercession, patronage, example
↑ veneration, invocation, thanksgiving
The Church Suffering
Ecclesia Patiens · the holy souls in purgatory
Those who died in grace but are being purified before entering glory. Certain of heaven, they can no longer help themselves — but they can be helped.
↓ suffrages: Masses, prayers, indulgences, alms
↑ gratitude & intercession (pious tradition)
The Church Militant
Ecclesia Militans · the faithful on earth
The wayfarers still fighting the world, the flesh, and the devil — the only state in which merit can be gained and mercy can still be squandered.
The saints' intercession reaches the holy souls as well as the living; and the Church permits the faithful privately to ask the prayers of the souls in purgatory, though whether those souls know and pray for us is a common and pious opinion of theologians (held by St. Robert Bellarmine and St. Alphonsus) rather than defined doctrine.
The Three States Considered
Triumphant, Suffering, Militant
In Heaven
The Church Triumphant
“They shall see his face… and they shall reign for ever and ever.” — Apocalypse 22:4–5
The saints have finished the course and kept the faith; they behold God as He is, in the beatific vision, secure forever. Far from forgetting the earth, their charity is now perfect: the Apocalypse shows the elders offering “the prayers of the saints” before the throne like incense (Apoc. 5:8), and the Church has always begged their intercession — above all that of the Blessed Virgin, then of St. Joseph, the Apostles, martyrs, and all the blessed company kept on the liturgical calendar and crowned each year on All Saints (November 1).
Here the classic distinction guards the honor of God: to God alone is given latria, adoration; to the saints, dulia, veneration; to Our Lady, hyperdulia, a veneration above the other saints but infinitely below adoration. Catholics do not worship the saints; they honor the masterpieces and beg the prayers of friends who stand nearer the King — exactly as one Christian on earth may ask another to pray for him, only these brethren pray with charity made perfect.
Apocalypse 5:8; 2 Machabees 15:12–14; Trent, Session 25; CCC 954–957
In Purgatory
The Church Suffering
“It is therefore a holy and wholesome thought to pray for the dead, that they may be loosed from sins.” — 2 Machabees 12:46
Nothing defiled can enter heaven (Apoc. 21:27); yet many die in God's friendship while still owing the debt of temporal punishment or bearing the remains of venial sin. For these the Church has always taught — defined at Lyons II, Florence, and Trent — that there is a purification after death, and that the souls detained there are helped by the suffrages of the faithful, but especially by the acceptable sacrifice of the altar. This is why the Church has prayed for her dead from the catacombs onward, keeps All Souls' Day (November 2) and the whole of November for them, offers Gregorian Masses, and enriches prayers and works with indulgences applicable to the departed.
The holy souls are the Church Suffering but also the Church certain: confirmed in grace, unable to sin, sure of glory — suffering with hope, as no one on earth suffers. Their one poverty is that the night has come in which no man can work (John 9:4): they can no longer merit or satisfy for themselves. They depend on us; and charity toward them is the most selfless almsgiving in the Church, given to those who can repay only by prayer.
2 Machabees 12:43–46; 1 Corinthians 3:13–15; Lyons II, 1274; Florence, 1439; Trent, Session 25; CCC 958, 1030–1032
On Earth
The Church Militant
“The life of man upon earth is a warfare.” — Job 7:1
The faithful on earth are called militant — fighting — because their state is one of unfinished battle against three enemies the tradition names together: the world, the flesh, and the devil. St. Paul's armory describes it without embarrassment: “our wrestling is not against flesh and blood, but against principalities and powers” — therefore take the armour of God, the shield of faith, the helmet of salvation, the sword of the Spirit (Eph. 6:11–17). Confirmation anoints every Catholic a soldier in this sense; the enemy is never our neighbor, but sin.
Yet the Militant state holds a strange privilege the other two lack: only the wayfarer can still merit — grow in grace, gain glory, satisfy for sin, and win treasure for others. The saints can pray but no longer grow; the holy souls can suffer but no longer earn; the poorest laborer on earth, in the state of grace, can enrich the whole Body by a Mass devoutly heard, a rosary, an alms, a mortification offered up. Every member of the Church Militant fights, and every one is also a supply line for the other two states.
Job 7:1; Ephesians 6:10–17; 2 Timothy 4:7; CCC 954, 2015–2016
The Ninth Article of the Creed
The Communion of Saints
When the Apostles' Creed confesses “the communion of saints,” it names the living bond among the three states. The phrase carries a double sense, and the Church intends both: a communion of holy persons (sancti) — the saints in heaven, the souls in purgatory, the faithful on earth — and a communion in holy things (sancta): the faith, the sacraments, above all the Blessed Eucharist, the charisms, and the common treasury of spiritual goods.
Because the members share one life, nothing good in the Body is private. The merits of Christ, superabundant and infinite, together with the prayers and good works of the Blessed Virgin and all the saints, form what the Church calls her treasury — not a bank of things but the living exchange of charity — from which she dispenses indulgences and by which the holiness of each profits all. The reverse is also true and sobering: as every grace circulates, every sin impoverishes the whole Body. No man is damaged alone, either.
Three practices of ordinary Catholic life are simply this article of the Creed put into act: asking the saints' intercession (the Militant invoking the Triumphant), praying and offering Masses for the dead (the Militant relieving the Suffering), and offering up one's own works and sufferings for others, living and dead. St. Paul gives that last practice its charter in one of Scripture's most astonishing sentences: “I… fill up those things that are wanting of the sufferings of Christ, in my flesh, for his body, which is the church” (Col. 1:24). Nothing is lacking to Christ's Passion in itself; what remains is its application through the members — and He has willed that our sufferings, joined to His, should carry it.
“Let us rejoice then and give thanks that we have become not only Christians, but Christ… Marvel and rejoice: we have become Christ.”
St. Augustine, Tractates on the Gospel of John, 21
Caput et Anima
The Head, the Soul, and the Mother
Christ the Head. As the head rules, sees for, and vivifies the body, so Christ governs the Church, from whom all her light and life descend: “of his fulness we all have received” (John 1:16). Because the Head is in glory while the members still fight and suffer, the Body spans heaven and earth by its very constitution. On earth Christ rules His Body visibly through His Vicar, the successor of Peter — so that, as Pius XII teaches, Christ and His Vicar form one only Head, and it is dangerous error to accept an invisible Church of charity while rejecting her visible government.
The Holy Ghost the Soul. What the soul is to the human body — one principle of life present whole in every member — the Holy Ghost is to the Church: uniting saint in heaven, soul in purgatory, and sinner-struggling-to-be-saint on earth in one supernatural life. This is why the Communion of Saints is no polite metaphor: the same Spirit literally dwells in all.
Mary the Mother. The Mother of the Head is Mother of the members. St. Augustine says she cooperated by her charity in the birth of the faithful in the Church; St. Pius X calls her Mother of us all in the order of grace; and from the Cross the office was given in person: “Behold thy mother” (John 19:27). She is the neck through which, the saints delight to say, the graces of the Head descend to the Body — Queen of the Triumphant, comforter of the Suffering, and Help of Christians still in the field.
At One Glance
The Three States Compared
The traditional names remain in Catholic use; more recent catechesis (CCC 954) describes the same three states as the faithful who are pilgrims on earth, those being purified, and those in glory — “all, however, in their different ways and degrees, in communion in the same charity of God and neighbor.”
“For all who are in Christ, having his Spirit, form one Church and cleave together in Him.”
Lumen Gentium, 49 — on the union of the heavenly and pilgrim Church
For the Layman
Living Inside the Body
This doctrine, well believed, changes the texture of ordinary days. It means the poor man's rosary strengthens missionaries he will never meet; that a mother's offered exhaustion may loose a soul she never knew from purgatory; that the friend who died last winter is not lost to us but has only changed states within the same family, and can still be loved effectively — by suffrage now, by reunion hereafter. It means the saints are not distant portraits but elder brethren at their post; that sin is never private; that no suffering need be wasted; and that the loneliest Catholic at a weekday Mass stands, in fact, in the largest company on earth or above it — the whole Christ, Head and members, of whom he is one living cell.
The old aspiration gathers the whole page into a breath: May the divine assistance remain always with us, and may the souls of the faithful departed, through the mercy of God, rest in peace. Amen.
