Divine Simplicity and the Trinity Explained

A Relational Vision of the One God

Intro: Summary

I want to portray the Trinity from simplicity so its harmony shows through and through. I therefore confess one absolutely simple divine essence that eternally gives itself in three irreducible relations of origin: the Father as originary Gift, the Son as the Gift perfectly received and returned, and the Spirit as the Gift-of-Gift (spiration). On this view relation and essence are identical and unity is preserved while real personal distinction is grounded. Identity here is provenance. The result is a structured singular: one reality, internally articulated by relations of origin, not by parts.

Divine Simplicity and Triune Relations

God is sheer act, actus purus, pure actuality with no unrealized potency, “one essence, substance, or nature absolutely simple.”¹ Nothing can be added, subtracted, or layered upon that plenitude. John Scotus Eriugena evokes it as “the ineffable and incomprehensible radiance of the divine goodness… better known through not-being-known.”² ³ Within that unbroken light the Church nevertheless confesses three: Father, Son, and Holy Spirit. Joseph Ratzinger gives the key, “In God, person means relation… relation is the person itself.”⁴ Thomas Aquinas had already cut the same line in scholastic stone, “Relation really existing in God is really the same as His essence,”⁵ and again, “The persons are the subsisting relations themselves; it is not against the simplicity of the divine persons for them to be distinguished by the relations.”⁶

Accordingly, the Father is not a slice of deity but paternity itself, the originary Gift. The Son is not a second substance but filiation, Gift perfectly received and perfectly returned. The Spirit is not a tertiary fragment but spiration, the Gift-of-Gift, the breathing of mutual love. The Spirit therefore proceeds eternally from the Father through the Son, so that one act of spiration manifests their shared communion without subordinating either. “So the Father is God, the Son is God, and the Holy Spirit is God; yet they are not three Gods, but one God.”⁷ The Council of Florence confirms, “Each of the Persons is wholly in the others.”⁸ Equality of essence alongside order of origin—“equality according to the essence, but order according to origin”⁹—stands without subordination, for in God relation is essence. No parts. No sequence. Taxis names origin, not time or rank.

One Eternal Act of Self-Gift (Christically Specified)

Because relation and essence coincide, every divine attribute is simply the one God under a particular vantage—a mode of self-manifestation that preserves unity while clarifying perspective.¹⁰ All operations toward creation are therefore a single, indivisible act of the tri-personal God, personally enacted according to origin. Since the absolutely simple essence is wholly present in each subsisting relation, any attribute we name—wisdom, power, love—is nothing but the same undivided God disclosed under a distinct vantage. Appropriations help contemplation without dividing the work: the Father as fountainhead, the Son as through-whom, the Spirit as perfecting presence.

In relation to creation, that one operation is Christically specified without compromising simplicity or freedom. God freely wills to communicate divine life; given that free decree, the creature-facing mode of the one act is Christic throughout. This is not a “second act.” It is the same act disclosed from the Father, through the Son, in the Holy Spirit.

Jean-Luc Marion catches the cadence of givenness: “The phenomenon shows itself only insofar as it gives itself,”¹¹ and “The gift depends only on itself to give itself.”¹² God is never first something that later decides to love; God is the act of self-giving whose excess invites created participation. Saint Elizabeth of the Trinity compresses it into one gasp of prayer, “O my Three, my All!”¹³

Metaphysical Frame: Primitives, Participation, Analogy

Jiri Benovsky notes that “relations are as fundamental as the things they relate; in some cases the relation is ontologically prior to its relata.”¹⁴ Such primitives, he adds, are “problem-solvers,”¹⁵ halting regress. In God the relations-of-origin are exactly such primitives; nothing lies beneath them, for they are identical with the unum esse they express. In creatures, any hint that relation precedes relata remains strictly analogical, preserving the infinite gap between created dependence and divine self-subsistence.¹⁸

Erich Przywara’s analogia entis amplifies the discipline: “Every similarity between Creator and creature always already implies an even greater dissimilarity.”¹⁶ Created being forever “swings between its own finite essence and its ceaseless orientation to the divine plenitude.”¹⁷ Even when physics teases that relation may precede relata, it only echoes what is supremely true in God: subsisting relations are ontological firsts. Dionysian apophasis keeps our speech reverent (CCC §43): we name by participation and eminence, never by putting God and creatures under a common measure.¹⁸

Summation

If this lands, simplicity and Trinity sound together. God is simultaneously and inseparably subsistent tri-personal relationality and the infinite communion constituted by those very relations. One simple essence; three subsisting relations of origin; one indivisible act personally enacted according to taxis. No part precedes the whole. No attribute bloats the substance. The Father is the eternal Giver, the Son the Gift received and returned, the Spirit the Gift-as-communion. From the Athanasian Creed to the baptismal font the Church proclaims the mystery, “three persons indeed but one essence, substance, or nature absolutely simple.”¹ Thus the mystic’s cry becomes ecclesial confession: One God, Father, Son, and Holy Spirit—eternal Gift, eternal Giver, eternal Communion.

Numbered Notes Key

Fourth Lateran Council, Firmiter credimus (1215).
John Scotus Eriugena, Periphyseon I (trans. O’Meara).
John Scotus Eriugena, further exposition in Periphyseon I on “nothing.”
Joseph Ratzinger, “On the Understanding of ‘Person’ in Theology” (1966).
Thomas Aquinas, Summa Theologiae I, q. 28, a. 2, ad 3.
Thomas Aquinas, ST I, q. 40, a. 1, ad 1.
Athanasian Creed, lines 15–16.
Council of Florence, Laetentur caeli (1439).
Thomas Aquinas, ST I, q. 42, a. 4.
Robert Dryer, “What’s a Mode and Vantage in Divine Simplicity?” https://robertdryer.com/whats-a-mode-and-vantage-in-divine-simplicity/
Jean-Luc Marion, Being Given, Book I, §§1 and 6.
Jean-Luc Marion, Being Given, Book III, §11.
St Elizabeth of the Trinity, Prayer, 21 Nov 1904.
Jiri Benovsky, “Metaphysics of Relations,” Metaphilosophy 42 (2011) 170.
Jiri Benovsky, “Primitives,” in Routledge Handbook of Metametaphysics (2020).
Erich Przywara, Analogia Entis, Part I, ch. 3.
Erich Przywara, Analogia Entis, Preface to 1932 edition.
Catechism of the Catholic Church §43 (Denz.-Hün. 36).