A comparative analysis of Catholic mystical theology and Perennialist gnosis, demonstrating that Catholic mystics preserve the Creator-creature distinction even in the highest states of union, while Perennialists claim ontological identity with the Absolute.
Both Catholic mystical theology and Perennialist gnosis speak of "union with God" or "realization of the Absolute." Both traditions emphasize the need for purification, detachment from creatures, and transcendence of discursive reason. Both use language that can sound strikingly similar: the soul is "transformed in God" (John of the Cross), becomes "one with God" (Teresa of Avila), or realizes "I am Brahman" (Śaṅkara).
Yet beneath this superficial similarity lies a fundamental metaphysical divide. Catholic mysticism is transformation by grace into likeness with God while remaining ontologically distinct. Perennialist gnosis is recognition of pre-existing ontological identity with the Absolute. The difference is not merely terminological but metaphysical: it concerns the very nature of the soul, the nature of God, and the nature of union itself.
This page presents extensive quotations from the Catholic mystical tradition—John of the Cross, Teresa of Avila, and the Cloud of Unknowing—to demonstrate that even in the highest states of mystical union, the Creator-creature distinction is preserved. It then contrasts this with Perennialist gnosis, which claims that this distinction is ultimately illusory and that the soul's true nature is identity with Brahman.
The Perennialist attempt to assimilate Catholic mysticism to Advaita Vedānta requires either fundamentally misreading the Catholic mystics or fundamentally misreading Śaṅkara—or both. The two paths are not complementary but mutually exclusive.
John of the Cross begins his treatment of mystical union by making a crucial distinction between two kinds of union with God: substantial union and union of likeness.
Ascent of Mount Carmel, Book II, Chapter V, §3
God dwells and is present substantially in every soul, even in that of the greatest sinner in the world. And this kind of union is ever wrought between God and all the creatures, for in it He is preserving their being: if union of this kind were to fail them, they would at once become annihilated and would cease to be. And so, when we speak of union of the soul with God, we speak not of this substantial union which is continually being wrought, but of the union and transformation of the soul with God, which is not being wrought continually, but only when there is produced that likeness that comes from love; we shall therefore term this the union of likeness, even as that other union is called substantial or essential. The former is natural, the latter supernatural. And the latter comes to pass when the two wills — namely that of the soul and that of God — are conformed together in one, and there is naught in the one that is repugnant to the other. And thus, when the soul rids itself totally of that which is repugnant to the Divine will and conforms not with it, it is transformed in God through love.
This distinction is fundamental. Substantial union is the ontological dependence of every creature on God for its existence. This union is natural, continuous, and universal—even sinners possess it, for without it they would cease to exist. Union of likeness is the supernatural transformation of the soul by grace, whereby the soul's will is conformed to God's will. This union is supernatural, intermittent (it can be lost by sin), and particular (not all souls possess it).
Crucially, John does not say that mystical union is the realization that substantial union is all there is, or that the soul discovers it was always God. He says mystical union is something additional to substantial union—a supernatural gift that transforms the soul into God's likeness.
John of the Cross is famous for his emphasis on detachment and the "dark night" of purgation. The soul must be stripped of all attachment to creatures, all reliance on its own understanding and abilities. But this stripping is not the annihilation of the soul's existence—it is the removal of obstacles to receiving God's likeness.
Ascent of Mount Carmel, Book II, Chapter V, §4
This is to be understood of that which is repugnant, not only in action, but likewise in habit, so that not only must the voluntary acts of imperfection cease, but the habits of any such imperfections must be annihilated. And since no creature whatsoever, and none of its actions or abilities, can conform or can attain to that which is God, therefore must the soul be stripped of all things created, and of its own actions and abilities — namely, of its understanding, perception and feeling — so that, when all that is unlike God and unconformed to Him is cast out, the soul may receive the likeness of God; and nothing will then remain in it that is not the will of God and it will thus be transformed in God. Wherefore, although it is true that, as we have said, God is ever in the soul, giving it, and through His presence conserving within it, its natural being, yet He does not always communicate supernatural being to it. For this is communicated only by love and grace, which not all souls possess; and all those that possess it have it not in the same degree; for some have attained more degrees of love and others fewer. Wherefore God communicates Himself most to that soul that has progressed farthest in love; namely, that has its will in closest conformity with the will of God. And the soul that has attained complete conformity and likeness of will is totally united and transformed in God supernaturally.
Note the key phrases: "the soul may receive the likeness of God," "it will thus be transformed in God," "God communicates Himself... by love and grace." The language is consistently that of reception, transformation, and communication—not recognition of pre-existing identity. The soul receives something it did not previously possess; it is transformed into something it was not before; God communicates to it a supernatural being that is distinct from its natural being.
John of the Cross uses bold language: the soul is "transformed in God," "united and transformed in God supernaturally." But he is careful to specify that this transformation is a matter of likeness, not identity. The soul becomes like God by grace; it does not become God by nature.
Moreover, John explicitly states that this union can be possessed "in different degrees"—some souls have "more degrees of love and others fewer." If the union were ontological identity, there could be no degrees. Either the soul is God or it is not. But if the union is participation in God's life by grace, then degrees make perfect sense: some souls participate more fully, others less fully.
Ascent of Mount Carmel, Book II, Chapter V, §11
Wherefore, although in this life here below we find certain souls enjoying equal peace and tranquillity in the state of perfection, and each one of them satisfied, yet some of them may be many degrees higher than others. All, however, will be equally satisfied, because the capacity of each one is satisfied. But the soul that attains not to such a measure of purity as is in conformity with its capacity never attains true peace and satisfaction, since it has not attained to the possession of that detachment and emptiness in its faculties which is required for simple union.
Each soul has a capacity for union with God, and this capacity can be more or less fully satisfied. This presupposes that the soul remains a distinct entity with its own capacity, which can be filled by God's grace. If the soul simply were God, there would be no "capacity" to be filled—there would only be the recognition that capacity and fullness are identical.
Teresa of Avila's description of the Seventh Mansion—the state of spiritual marriage—uses language that can sound like non-dual identity. She speaks of the soul being "made one with God," of rain falling into a river so that "the river and rain water cannot be divided."
Interior Castle, Seventh Mansion, Chapter II, §3
As far as can be understood, the soul, I mean the spirit of this soul, is made one with God Who is Himself a spirit, and Who has been pleased to show certain persons how far His love for us extends in order that we may praise His greatness. He has thus deigned to unite Himself to His creature: He has bound Himself to her as firmly as two human beings are joined in wedlock and will never separate Himself from her.
But note the crucial qualifications: "He has thus deigned to unite Himself to His creature." Teresa does not say "the soul realizes it was always God" or "the distinction between soul and God is seen to be illusory." She says God unites Himself to His creature—presupposing that the creature remains a creature even in the highest union.
Interior Castle, Seventh Mansion, Chapter II, §5
But spiritual marriage is like rain falling from heaven into a river or stream, becoming one and the same liquid, so that the river and rain water cannot be divided; or it resembles a streamlet flowing into the ocean, which cannot afterwards be disunited from it. This marriage may also be likened to a room into which a bright light enters through two windows--though divided when it enters, the light becomes one and the same.
This analogy is often cited by Perennialists as evidence that Catholic mysticism teaches non-dual identity. But Teresa immediately qualifies it with the analogy of light entering through two windows: "though divided when it enters, the light becomes one and the same." The light remains distinct in its source even as it unifies in the room.
Moreover, Teresa explicitly distinguishes between spiritual betrothal (which can be dissolved, where "each part then remains a thing by itself") and spiritual marriage (which is permanent). But even spiritual marriage can be lost by sin, as Teresa makes clear in §13. If the union were ontological identity, it could not be lost—for the soul cannot cease to be what it is by nature.
In a passage often overlooked by Perennialists, Teresa explicitly affirms that even in the Seventh Mansion, the soul remains a creature:
Interior Castle, Seventh Mansion (quoted in Carmelite Quotes, November 30, 2022)
Since this castle is a creature and the difference, therefore, between it and God is the same as that between the Creator and His creature...
This is unambiguous. The soul—even in the Seventh Mansion, even in spiritual marriage—remains a creature. The difference between the soul and God is the difference between Creator and creature. This difference is not illusory, not provisional, not a concession to lower understanding. It is the permanent ontological structure of reality.
Interior Castle, Seventh Mansion, Chapter II, §9
Our Lord's words act within us, and in these cases they must have wrought their effect in the souls already disposed to banish from within themselves all that is corporal and to retain only what is spiritual, in order to be joined in this celestial union with the uncreated Spirit. Without doubt, if we empty ourselves of all that belongs to the creature, depriving ourselves of it for the love of God, that same Lord will fill us with Himself.
The soul must "empty" itself of attachment to creatures, but this emptying is not the annihilation of the soul's existence. It is the removal of obstacles so that "the same Lord will fill us with Himself." The language is of filling, not recognizing. God fills the soul with His presence; the soul does not recognize that it was always God.
Interior Castle, Seventh Mansion, Chapter II, §13
Do I seem to imply that after God has brought the soul thus far it is certain to be saved and cannot fall into sin again? I do not mean this: whenever I say that the soul seems in security, I must be understood to imply for as long as His Majesty thus holds it in His care and it does not offend Him.
This is decisive. If the soul could fall from this state by sin, then the union is not ontological identity. Ontological identity cannot be lost—the soul cannot cease to be what it is by nature. But supernatural union by grace can be lost, because it is a gift that requires continued conformity of will.
In Advaita Vedānta, by contrast, the realization of Ātman-Brahman identity is permanent. Once ignorance is dispelled, it cannot return. The liberated sage has realized what was always true and cannot "fall" from this realization. The difference between Catholic mysticism and Advaitic gnosis could not be clearer.
The Cloud of Unknowing represents the apophatic tradition in Catholic mysticism: the approach to God through darkness, unknowing, and the negation of all concepts. God is approached not by affirming what He is, but by denying that He is anything we can conceive.
This might seem to converge with Advaita's neti neti ("not this, not this")—the systematic negation of all attributes to arrive at pure, attributeless Brahman. But there is a crucial difference: in the Cloud, the "darkness" is not ignorance to be dispelled, but the proper recognition of God's transcendence. The "cloud of unknowing" is not avidyā (ignorance) but the acknowledgment that God infinitely surpasses all human comprehension.
Commentary on Cloud of Unknowing (Unam Sanctam Catholicam blog)
The phrase 'cloud of unknowing' refers to the infinite barrier that will always exist between Creator and creature that can never be fully overcome.
The "cloud" is not a temporary obstacle but a permanent barrier. Even in the highest mystical union, the Creator-creature distinction remains. The soul approaches God through darkness precisely because God's transcendence can never be fully comprehended or overcome.
This is fundamentally different from Advaita, where the "darkness" of ignorance is dispelled to reveal the pre-existing identity of Ātman and Brahman. In the Cloud, the darkness is not dispelled—it is entered into as the proper mode of approach to the transcendent God.
Facebook discussion on Carmelite tradition's understanding of theosis
It respects the Creator-creature distinction, emphasizing instead a relational and mystical union with God... Cloud of Unknowing, which, like St. John of the Cross and St. Teresa of Avila, maintains this distinction even in the highest states of union.
The Carmelite tradition—which includes John of the Cross, Teresa of Avila, and is influenced by the Cloud of Unknowing—consistently emphasizes relational union rather than ontological identity. The soul is united to God by love and grace, but remains distinct from God in being.
Perennialist gnosis, rooted in Advaita Vedānta, claims that the soul's true nature is identity with Brahman. The great Upanishadic saying "Tat Tvam Asi" (That Thou Art) declares this identity. The individual self (Ātman) is not merely like Brahman or united to Brahman—it is Brahman. The appearance of distinction is due to ignorance (avidyā) or illusion (māyā).
For extensive quotations from Śaṅkara demonstrating this position, see the dedicated Vedānta-Thomism comparison page. The key point here is that Perennialist gnosis claims ontological identity, not merely moral or mystical union.
For Perennialists, the realization of Ātman-Brahman identity is a natural capacity of the intellect. It does not require supernatural grace, though grace may facilitate it. The intellect, properly purified and directed, can realize its own identity with the Absolute.
This is fundamentally different from Catholic mysticism, where union with God is a supernatural gift. As John of the Cross explicitly states, "God does not always communicate supernatural being to it. For this is communicated only by love and grace, which not all souls possess." Union with God is not a natural capacity but a gratuitous gift.
In Advaita Vedānta, liberation (moksha) is not the attainment of something new, but the recognition of what has always been true. The self was never truly bound; it only appeared to be bound due to ignorance. When ignorance is removed, the self is seen to have always been Brahman.
In Catholic mysticism, by contrast, union with God is transformation. The soul is changed by grace into something it was not before. It receives a supernatural being that it did not previously possess. As John of the Cross says, "when all that is unlike God and unconformed to Him is cast out, the soul may receive the likeness of God." The soul receives; it does not merely recognize.
In Advaita Vedānta, the realization of Ātman-Brahman identity is permanent. Once ignorance is dispelled, it cannot return. The liberated sage has realized what was always true and cannot "fall" from this realization.
In Catholic mysticism, by contrast, even the highest mystical union can be lost by sin. As Teresa of Avila explicitly states, the soul "can fall into sin again" and the union is secure only "for as long as His Majesty thus holds it in His care and it does not offend Him." This proves that the union is not ontological identity but supernatural grace.
Perennialists often cite passages from John of the Cross or Teresa of Avila that speak of the soul being "transformed in God" or "made one with God" as evidence that Catholic mysticism teaches the same non-dual identity as Advaita. But this reading ignores:
The Perennialist reading requires systematically ignoring or reinterpreting these qualifications. It treats the Catholic mystics' bold language of union as if it meant the same thing as Śaṅkara's "Tat Tvam Asi," when in fact the metaphysical frameworks are fundamentally different.
| Topic | Catholic Mysticism | Perennialist Gnosis |
|---|---|---|
| Nature of Union | Union of likeness; transformation by grace; conformity of wills | Ontological identity; Ātman = Brahman; recognition of pre-existing oneness |
| Role of Grace | Supernatural gift; "communicated only by love and grace" (John of the Cross) | Natural capacity of intellect; grace may facilitate but is not strictly necessary |
| Transformation vs. Recognition | Soul receives something new; "the soul may receive the likeness of God" | Soul recognizes what always was; "the self was never bound" |
| Creator-Creature Distinction | Always preserved; "the difference between it and God is the same as that between the Creator and His creature" (Teresa) | Ultimately illusory; product of ignorance (avidyā) or illusion (māyā) |
| Permanence | Can be lost by sin; "for as long as His Majesty thus holds it in His care and it does not offend Him" (Teresa) | Cannot be lost once realized; recognition of what has always been true |
| Degrees of Union | Admits of degrees; "some have attained more degrees of love and others fewer" (John of the Cross) | No degrees; either realized or not realized |
| Apophatic Theology | "Cloud of unknowing" is permanent barrier acknowledging God's transcendence | "Neti neti" (not this, not this) removes ignorance to reveal identity |
| Language of Union | Reception, transformation, communication, filling, conformity | Recognition, realization, removal of ignorance, unveiling |
| Ontological Status | Soul remains creature; participates in God's life but does not become God | Soul is Brahman; apparent distinction is illusory |
| Knowledge vs. Love | Union perfected by love; "when the two wills are conformed together in one" | Liberation by knowledge (jñāna); "only knowledge liberates" |
The Perennialist attempt to assimilate Catholic mysticism to Advaita Vedānta fails because it requires ignoring the explicit and consistent teaching of the Catholic mystics that the Creator-creature distinction is preserved even in the highest states of union. This is not a peripheral or negotiable point—it is the very heart of Catholic mystical theology.
The difference between transformation by grace and recognition of identity is not merely terminological. It reflects fundamentally different metaphysical visions:
One cannot coherently affirm both. The Perennialist who claims to be Catholic while teaching Advaitic gnosis is either fundamentally misunderstanding Catholicism or fundamentally misunderstanding Advaita—or both. As demonstrated in the Vedānta-Thomism comparison, these are not complementary perspectives on the same truth, but mutually exclusive metaphysical systems.
The Catholic mystics—John of the Cross, Teresa of Avila, the author of the Cloud of Unknowing—all teach transformation by grace into likeness with God while remaining ontologically distinct. This is not a "lower" or "exoteric" teaching that conceals a "higher" or "esoteric" doctrine of identity. It is the consistent, explicit, and non-negotiable teaching of the Catholic mystical tradition.
Rama Coomaraswamy's attempt to reconcile Catholicism with Perennialism requires either abandoning the Catholic doctrine of creation, grace, and the Creator-creature distinction, or abandoning the Perennialist doctrine of Ātman-Brahman identity. There is no third option. One must choose.
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