What Is Sanctifying Grace?

Divine Life, Not Merely a Favour

The word grace can mislead because ordinary speech often gives it a weakened sense. A ruler grants clemency to a prisoner, a person moves with grace, and we give thanks for a service. In each case grace denotes benevolence or a favour that remains external to its recipient. If sanctifying grace were only that — divine benevolence, God's favourable regard resting upon us — it would change nothing within us; it would change only God's attitude toward us.

Catholic faith affirms something altogether different. Sanctifying grace produces a real effect within the soul. Saint Thomas Aquinas demonstrates this through a luminous comparison. Human love presupposes the good it finds in the beloved; it does not create that good. God's love, by contrast, causes good to arise in the creature he loves:

“Every act of God's love causes some good in the creature... There is another, special love whereby God draws the rational creature above the condition of its nature.” — Saint Thomas Aquinas, Summa Theologiae, I-II, q. 110, a. 1^[9]

When God loves us with the love that sanctifies, he does not merely wish good for us: he truly places that good within us. Sanctifying grace is not a label attached to the soul from outside, but a real newness inscribed within it. Its truest image is therefore not merely favour or pardon — although grace includes pardon — but life: life of a higher order grafted onto our natural life as a branch is grafted onto the vine^[10].

“Sharers in the Divine Nature”: The Heart of the Definition

The decisive phrase comes from the Second Letter of Saint Peter. God, the Apostle writes, has granted us “very great and precious promises, so that through them you may become sharers in the divine nature”^[11]. This expression is the scriptural foundation of the whole doctrine of sanctifying grace. It does not mean that we become God by nature: the creature remains a creature, infinitely distinct from the Creator. It means that, by participation, God communicates to us something proper to himself — his life, holiness and sonship.

The Catechism adopts this exact vocabulary: “Grace is a participation in the life of God. It introduces us into the intimacy of Trinitarian life”^[12]. This participation is so real that Scripture uses the strongest language: through it we become “children of God”^[13], “adopted sons” able to call God “Father”^[14], and “co-heirs” with Christ^[15]. These are not pious metaphors, but the description of an ontological change, a new being received from God. Saint Paul calls it a “new creation”: “If anyone is in Christ, there is a new creation: everything old has passed away; see, everything has become new”^[16].

Tradition coined the word deification or divinization for this reality. The Word became man, the Fathers teach, precisely to divinize us. Saint Athanasius summed it up in a celebrated sentence:

“The Son of God became man so that we might become God.” — Saint Athanasius of Alexandria, On the Incarnation of the Word, 54, 3^[17]

Saint Thomas repeats the same truth in his Office for Corpus Christi: “The only-begotten Son of God, wishing to make us sharers in his divinity, assumed our nature, so that he, made man, might make men gods”^[18]. Sanctifying grace is precisely the gift through which this divinization is accomplished in every baptized person.

The Vocabulary of Grace

Several expressions name the same reality while emphasizing different aspects. Confusing them is not serious, but understanding their emphasis helps readers follow the Catechism and the saints. The following table summarizes this vocabulary and what each term emphasizes.

All these expressions indicate one reality: the received, stable and deifying divine life that makes the soul holy and a friend of God.

The most useful and often neglected distinction is between sanctifying or habitual grace and actual grace. The Catechism separates them clearly:

“Habitual grace, the permanent disposition to live and act in keeping with God's call, is distinguished from actual graces which refer to God's interventions, whether at the beginning of conversion or in the course of the work of sanctification.” — Catechism of the Catholic Church, § 2000^[19]

The simplest image is that of life and breath. Sanctifying grace is like biological life: a permanent state that remains even while I sleep and makes me a living being. Actual grace is like an impulse or particular assistance: an interior motion by which God enlightens me at one moment, urges me to resist a temptation or inclines me toward an act of charity, then passes once its effect is achieved. One is a state of being; the other is a passing movement^[20].

The two are intimately connected. Through actual graces God prepares and leads the sinner to receive sanctifying grace in Baptism or confession; through actual graces he then sustains the sanctified soul so that it may act and progress. “The preparation of man for the reception of grace is already a work of grace,” the Catechism recalls with Saint Augustine^[21]. This article concerns sanctifying grace alone; actual grace, with its own distinctions, is treated in a separate article.

Calling grace divine life might sound merely poetic. Following Saint Thomas Aquinas, Catholic theology gives it rigorous precision against two errors: reducing grace to an external favour that changes nothing in us, or identifying it with God himself dwelling in the soul without an intermediary created gift.

Something Real, Not Merely Divine Benevolence

Grace “places something real in the soul”^[22]. This is no academic subtlety. It separates Catholic doctrine from a purely extrinsic account of justification in which God declares us righteous without truly making us righteous — like snow covering a dung heap without transforming it. The Council of Trent rejected that reduction: through justification, “the unjust person becomes just,” not by fiction but in truth^[23]. Grace heals and renews the inner person; it does not merely cover him.

An Habitual Quality of the Soul

What kind of created reality is grace? Saint Thomas answers: a quality, more precisely a habitus, a stable disposition inhering in the soul — as knowledge is a stable quality of the intellect or beauty a quality of the body^[24]. This is exactly what the Catechism means by habitual: sanctifying grace is an “habitual gift, a stable and supernatural disposition”^[25]. It is neither a fleeting act nor an emotion, but a new and permanent way of being that remains until mortal sin drives it from the soul. A person can sleep, work and attend to countless matters while remaining in a state of grace because the habitus abides beneath individual acts.

Saint Thomas says this quality is above human nature: neither a substance nor a part of our nature, but an “accidental form of the soul” — in other words, the soul (the “substance,” that is, what it is by nature) receives a real perfection added to it without being changed into something else (an “accidental form,” like the colour of a wall, which beautifies it without making it anything other than a wall) — by which the soul “participates in divine goodness.” As an expression or participation of divine goodness, grace is “nobler than the nature of the soul” itself^[26]. A quality nobler than the substance that bears it: the paradox of grace lies in that formula.

Its Seat Is the Essence of the Soul

The virtues reside in the soul's powers: faith in the intellect and charity in the will. Grace lies deeper still, in the very essence of the soul, prior to its powers^[27]. Through grace we are “begotten anew” as God's children, and generation first reaches the essence of a being before its faculties. As the powers flow from the soul's essence, so the virtues flow into its powers from grace planted in its essence:

“The nature of the human soul participates, according to a certain likeness, in the divine nature through a regeneration or new creation.” — Saint Thomas Aquinas, Summa Theologiae, I-II, q. 110, a. 4^[28]

Grace touches the human person at the root. It does not perfect only what I do or think; it first transforms what I am.

Distinct from the Virtues and Gifts It Produces

Sanctifying grace is not identical with the infused virtues — faith, hope and charity — or with the gifts of the Holy Spirit; it is their root and source^[29]. Grace resides in the essence, while the virtues and gifts reside in the powers it vivifies. Grace may be compared to the sap rising through a tree, and the virtues to the branches and fruit it produces. The Catechism therefore speaks of a genuine organism of supernatural life.

The Catechism gathers into one luminous paragraph all that the Most Holy Trinity gives with sanctifying grace at Baptism:

“The Most Holy Trinity gives the baptized sanctifying grace, the grace of justification: enabling them to believe in God, to hope in him, and to love him through the theological virtues; giving them the power to live and act under the prompting of the Holy Spirit through the gifts of the Holy Spirit; allowing them to grow in goodness through the moral virtues. Thus the whole organism of the Christian's supernatural life has its roots in Baptism.” — Catechism of the Catholic Church, § 1266^[30]

An organism is a living, articulated whole in which every organ receives life from one source. Sanctifying grace is that source, and everything else flows from it. Three great realities grow from it like branches from one trunk.

The Theological Virtues

With grace, God infuses the three theological virtues: faith adheres to God revealed, hope tends toward him as our blessedness, and charity loves him above all things. Trent expressly teaches that at justification a person receives together “faith, hope and charity”^[31]. Charity holds first place because it “unites perfectly with Christ” and makes the soul a “living member of his body”^[32]. Faith without charity remains “dead”^[33]; faith animated by charity is living faith, “working through love”^[34]. Sanctifying grace and charity are therefore always given together, although theology distinguishes them.

The Gifts of the Holy Spirit

Alongside the virtues, the Spirit places his seven gifts — wisdom, understanding, counsel, fortitude, knowledge, piety and fear of the Lord — making the soul docile and ready to follow his promptings. Virtues make us act at our own rhythm under reason enlightened by faith; the gifts dispose the soul to “live and act under the prompting of the Holy Spirit”^[35] with a readiness beyond virtue alone. They are like sails spread to let the soul be carried by the divine breath.

The Infused Moral Virtues

Grace also “allows [the baptized] to grow in goodness through the moral virtues”^[36]. The cardinal virtues themselves — prudence, justice, fortitude and temperance — receive a new, infused form ordered not only to human balance but to our supernatural end.

Remove sanctifying grace through mortal sin and charity disappears with it: the organism is mortally wounded. Restore grace through Penance and life rises again through every branch.

Sanctifying grace is not only a gift from God; it is inseparable from the presence of God himself within the soul. Theology calls this the Trinitarian indwelling. Wherever grace is, the Trinity gives itself there. Jesus promised it explicitly:

“Those who love me will keep my word, and my Father will love them, and we will come to them and make our home with them.” — Jesus, John 14:23^[37]

Temple of the Spirit, Dwelling of the Trinity

Saint Paul draws the conclusion: the soul in grace is a temple. “Do you not know that you are God's temple and that God's Spirit dwells in you?”^[38] — and again: “Your body is the temple of the Holy Spirit within you”^[39]. The baptized person becomes a “temple of the Holy Spirit”^[40]. This is not merely God's general presence sustaining every creature in existence, but a presence of friendship, by which God is present as the beloved to the one who loves and gives himself to be known and tasted.

Saint Elizabeth of the Trinity, the Dijon Carmelite who died in 1906, made this truth the centre of her spiritual life. She urged souls never to leave this inner sanctuary:

“The Trinity: this is our dwelling, our ‘home,’ the Father's house which we must never leave.” — Saint Elizabeth of the Trinity, Heaven in Faith, § 2^[41]

Deification, Fruit of the Divine Presence

This active presence divinizes. “It is through the Spirit that we participate in God... those in whom the Spirit dwells are divinized,” Saint Athanasius writes^[42]. Deification is not a static condition, but the radiance within the soul of the Trinity who dwells there. Saint Irenaeus had already said in the second century that the Son of God became man so that humanity might “receive divine filiation and become a son of God”^[43]. To live in grace is already to begin here below, beneath faith's veil, the life of Heaven itself: union with God fulfilled in the beatific vision.

This doctrine illuminates both Christian dignity and the gravity of sin. Saint Leo the Great told the baptized: recognize your dignity — having become sharers in the divine nature, do not return to your former baseness through unworthy conduct^[44]. Losing sanctifying grace is not breaking a regulation; it is expelling God from his own dwelling.

Baptism, Root of the Supernatural Life

Sanctifying grace is normally first received in sacramental Baptism. Baptism not only “purifies from all sins”; it makes the baptized person “a new creature, an adopted son of God... a partaker of the divine nature, member of Christ... and temple of the Holy Spirit”^[45]. Thus “the whole organism of the Christian's supernatural life has its roots in Baptism”^[46]. Without Baptism, the soul marked by original sin is deprived of this divine life; in sacramental Baptism it receives that life freely. The Church nevertheless teaches that God, who bound salvation to Baptism, did not bind himself to his sacraments: those who die for the faith without having received Baptism (baptism of blood), catechumens who die desiring Baptism (baptism of desire), and even those who through no fault of their own do not know the Gospel but sincerely seek God, can receive grace and attain salvation^[47] — Trent had already put it thus: after the promulgation of the Gospel, no one passes into the state of grace “without the bath of regeneration or the desire for it”^[48]. For this sacrament's necessity and meaning, see Is Baptism Necessary for Salvation? and Why Baptize Babies?.

The Sacraments as Channels of Grace

Baptism gives grace; the other sacraments increase, restore or strengthen it. Confirmation fortifies it, the Eucharist nourishes and increases it, Penance restores it to the soul that had lost it, and Anointing of the Sick strengthens it in trial. The sacraments are not empty signs: they effectively confer the grace they signify^[49]. The entire sacramental life is ordered toward one end: causing divine life to be born, preserved and increased within us.

Truly Infused, Not Merely Imputed

Here lies a major divergence from part of the Protestant theology born of the Reformation. In classical Lutheran doctrine, that by which the sinner is justified before God — the very foundation of justification — is Christ's righteousness imputed to him and received by faith; inward renewal is not denied, but it is the work and fruit of that justification, not its foundation. Luther himself thus distinguishes a “foreign” righteousness (aliena), Christ's own, received by faith, from a “proper” righteousness which flows from it as its fruit^[50]. The formula simul justus et peccator (“at once righteous and a sinner”) therefore does not mean that the sinner would in no way be inwardly transformed: the Catholic-Lutheran Joint Declaration on the Doctrine of Justification (1999) confesses together the forgiveness of sin and the gift of a new life (§ 22), a justifying faith “active in love” which does not remain without works (§§ 25-26), and clarifies on both sides the meaning of “at once righteous and a sinner” (§§ 28-29)^[51]. The Catholic Church teaches that God makes the sinner truly righteous by infusing real righteousness into the soul, which is the formal foundation of his justification. Trent defined this decisively:

“The single formal cause [of justification] is the justice of God, not that by which he himself is just, but that by which he makes us just... so that we are not merely considered righteous, but are called and truly are righteous.” — Council of Trent, session VI, chapter 7^[52]

Christian righteousness is called ours because “we are justified by that righteousness which inheres in us”^[53]. This does not diminish salvation's gratuity: righteousness remains a pure gift of God, merited by Christ's Passion alone and freely received. But the gift truly changes its recipient. The complete controversy concerning faith, works and merit belongs to Are We Saved by Faith Alone?; here it is enough to retain that sanctifying grace is infused, not a legal fiction.

Yes. Sanctifying grace is life, and life can die. This is the most serious dimension of the doctrine: this treasure placed within us is not inalienable — that is, it can be lost. The Church nevertheless states exactly by what it is lost and by what it is recovered.

Mortal Sin Drives Out Divine Life

Only mortal sin causes the loss of sanctifying grace: not every fault, but sin involving grave matter, full knowledge and deliberate consent. The Catechism states plainly:

“Mortal sin... results in the loss of charity and the privation of sanctifying grace, that is, of the state of grace. If it is not redeemed by repentance and God's forgiveness, it causes exclusion from Christ's kingdom and the eternal death of hell.” — Catechism of the Catholic Church, § 1861^[54]

Trent rejected the claim that grace, once received, cannot be lost: “The grace of justification once received is lost not only by unbelief... but also by any other mortal sin”^[55]. But the same council distinguishes: unbelief — sin against faith — makes one lose, together with grace, faith itself; every other mortal sin makes one lose grace without making one lose faith. The sinner then retains a dead faith, deprived of charity, showing that sanctifying grace and charity are more than faith alone. This loss is radical: it does not wound divine life but extinguishes it. That is why one may not receive Communion in mortal sin before reconciliation.

Venial Sin Wounds but Does Not Destroy It

Not every sin kills grace. Venial sin — a light fault, or grave matter without full knowledge or deliberate consent — wounds charity without destroying it. Trent teaches that even the justified sometimes fall into “daily sins, which are also called venial,” without thereby ceasing to be just^[56]. The soul remains alive and in grace, though weakened like a healthy body affected by illness without being killed. The full distinction is treated in What Is the Difference Between Mortal and Venial Sin?.

Recovering Grace: The Second Plank After Shipwreck

As long as a person lives, the loss of grace is never beyond remedy. God instituted the sacrament of Penance, which the Fathers described through a striking image:

“[The sacrament of Penance is] the second plank of salvation after the shipwreck which is the loss of grace.” — Council of Trent, session VI, ch. 14^[57]

Baptism is the ship that carried us; mortal sin is the shipwreck; confession is the plank by which the castaway reaches shore. Absolution restores sanctifying grace fully to the repentant soul^[58]. In an emergency without an available confessor, perfect contrition — repentance arising from love of God above all things — obtains forgiveness and grace immediately, provided it includes the resolve to confess as soon as possible^[59]. The practical path is explained in How to Make a Good Confession.

Yes — and it is one of the most encouraging truths of the Christian life. Sanctifying grace is not a fixed quantity received once for all. It can increase, together with charity, to degrees reached by the saints and that no one knows in advance.

“Further Justified”: Growth in Grace

Trent explicitly teaches this growth against the idea of a righteousness received once for all without progress:

“Those who have been justified... grow in that justice received through the grace of Christ, faith cooperating with good works, and they are further justified.” — Council of Trent, session VI, chapter 10^[60]

Three principal means increase grace. First are the sacraments, especially the Eucharist, which increases our union with Christ and preserves us from grave sins^[61]. Next is prayer, which obtains “the increase of grace and charity”^[62]. Finally come good works done in charity, through which the soul goes “from virtue to virtue” and is renewed “day by day”^[63]. The more the soul loves, the more grace increases; the more grace increases, the more the soul can love. It is an ascending circle with no assignable limit in this life.

Merit: God Crowns His Own Gifts

How can a creature “merit” anything before God, from whom everything comes? Catholic teaching holds two truths together. Strictly speaking, there is “no right or merit on the part of man” before God^[64], and no one can merit the first grace of conversion^[65]. Yet God freely chose to associate humanity with the work of his grace^[66], so acts accomplished under charity's impulse truly merit an increase of grace and eternal life. This merit is itself a gift:

“Grace has gone before us; now we are given what is due... Our merits are God's gifts.” — Saint Augustine, Sermon 298^[67]

Trent therefore says that God's goodness is so great that he wills his gifts to become our merits^[68]. Saint Thérèse of the Child Jesus, wishing to appear before God with “empty hands,” expressed this beautifully:

“In the evening of this life, I shall appear before you with empty hands, for I do not ask you, Lord, to count my works... I wish, then, to be clothed in your own Justice and to receive from your Love the eternal possession of yourself.” — Saint Thérèse of the Child Jesus, Act of Oblation to Merciful Love^[69]

Everything in the life of grace comes from God and returns to God: he gives grace, gives us the power to act through it, and crowns what he himself has wrought.

A final question often troubles souls: can I know with certainty that I possess sanctifying grace? The Church's answer is nuanced and deeply peaceful.

A Reality of Faith, Not Feeling

Because grace belongs to the supernatural order, it “escapes our experience and cannot be known except by faith”^[70]. We do not feel it as an emotion and cannot base absolute certainty on our feelings. Trent warns against false assurance as well as discouragement. Yet this does not leave the soul in anxiety: considering God's blessings in our life offers a guarantee that grace is at work within us^[71]. The fruits reveal the root: “You will know them by their fruits”^[72]. A life of charity, peace and fidelity to the commandments is the surest sign — without being mathematical proof — that divine life remains.

Trust Rather Than Anxiety

The Catechism illustrates the right attitude through Saint Joan of Arc's admirable answer when her judges tried to trap her by asking whether she knew she was in God's grace:

“If I am not, may God put me there; and if I am, may God so keep me.” — Saint Joan of Arc, trial at Rouen^[73]

The Christian need not oscillate between presumption, which treats grace as a possession owed to us, and scrupulosity, which always doubts it. Christian life is trusting poverty: we do what depends on us — flee mortal sin, receive the sacraments, love — and entrust the rest to mercy. Sanctifying grace is the greatest of gifts and also the most accessible, offered to everyone who asks through the means Christ left to his Church.

• What Is Actual Grace? — the passing help distinct from the permanent life of sanctifying grace.
• How Can Grace Be Explained Simply? — an accessible presentation of grace.
• What Is Justification? — the act by which God makes us righteous and gives sanctifying grace.
• What Is Sanctification? — growth in the divine life received.
• Are We Saved by Faith Alone? — the controversy concerning infused grace and merit.
• What Is the Difference Between Mortal and Venial Sin? — what destroys grace and what only wounds it.
• How to Make a Good Confession — the “second plank” by which lost grace is recovered.
• Is Baptism Necessary for Salvation? — the sacrament that first gives sanctifying grace.