@joey jojo
First, we need to define what we mean by "person." The traditional formulation of the Trinity is "one God in three persons." However, in modern language, the concept of "person" is practically identical with "being," and it has connotations such as "personality." Within the Trinity, these are "persons" only in a relative sense, in which sense the Father and the Son are not "persons" either, in the same way that humans are persons. It is more correct to speak of three subjects (supposita) or three subsistencies.
The Holy
Spirit is truly God—coequal, consubstantial, and coeternal with the Father and
the Son. He is not a mere force, energy, or divine influence, nor is He a
separate deity alongside the Father and the Son. He is the third Person of the
Blessed Trinity, fully God, yet distinct in personhood. To speak clearly and
faithfully, we must begin by carefully defining what it means to be a “person”
in the Trinity, and how this applies to the Holy Spirit.
The term
“person” in Trinitarian theology does not carry the modern psychological or
behavioral meaning it often does in casual speech today. It does not refer to
personality traits or psychological self-awareness. Rather, in classical
Catholic theology, especially as defined by Boethius and developed by Aquinas, a
“person” is an individual substance of a rational nature. In God, however, we
must refine this further, since God's nature is not divided among the Persons.
In the Trinity, there is one divine essence, one intellect, one will—shared
entirely and equally among the Father, the Son, and the Holy Spirit. The
distinction among the Persons lies not in what they are, but in how they
are related. The Father is unbegotten, the Son is begotten of the Father, and
the Holy Spirit proceeds from the Father and the Son as from one principle.
Therefore,
the Holy Spirit is not “another god,” but the same God. He is the same divine
being who is eternally breathed forth as the mutual Love between the Father and
the Son. He is not a separate mind, not a separate nature, but He is a distinct
person—a unique I within the Godhead. This can be difficult to
grasp because our human concept of “personality” is often tied to distinct
centers of consciousness, and this creates confusion. Some ask: does the
Trinity contain three egos, three “I”s, three consciousnesses? Are we not then
veering toward tritheism? But this is not how the Church speaks. In fact, we
must distinguish carefully: while there are indeed three Persons—and
hence three I’s—there is only one divine essence, and therefore
only one divine intellect and one divine will. So while the Father can say “I,”
and the Son can say “I,” and the Holy Spirit can say “I,” these three Persons
do not constitute three separate minds, nor do they each possess a different
divine essence. They each fully are the one and only God.
To
understand this, the analogy often employed by the Church Fathers and developed
by Aquinas is that of relations. In God, the Persons are distinct only
by their relations of origin. The Father is the origin without origin. The Son
is eternally begotten, meaning He receives the fullness of the divine nature
from the Father in an eternal act of generation. The Holy Spirit proceeds not
by generation but by spiration—He is spirated by the mutual love of the
Father and the Son. He is not their creation, not their product in time, but
their eternal gift to each other, their shared breath of divine Love. That is
why the Church speaks of Him as the “Gift,” the bond of charity, the living
flame of divine communion. And yet, as the Nicene Creed proclaims, He is “the
Lord and Giver of Life, who proceeds from the Father and the Son, who with the
Father and the Son is adored and glorified.” He is not a mere expression
of God’s power or presence—He is God.
This
understanding guards us from two major errors: on one side, modalism, which
says that God is only one person appearing in three different “modes” or roles;
and on the other side, tritheism, which would treat the Father, Son, and Holy
Spirit as three distinct gods. The Catholic faith avoids both extremes by
carefully affirming one essence in three Persons. The Holy Spirit is not
simply the “power” of God, as some heretical sects suggest. He is not a
faceless “force” like in pantheistic systems. A force does not speak, does not
love, does not intercede, does not grieve. But the Holy Spirit does all of
these things in Scripture. He teaches (John 14:26), He intercedes (Romans
8:26), He distributes gifts (1 Corinthians 12:11), He is lied to (Acts 5:3–4),
He sends (Acts 13:2), and He is named equally with the Father and the Son in
baptism (Matthew 28:19). These actions are not those of an impersonal energy
but of a divine person.
The Holy
Spirit, then, is not a separate deity, nor is He a mere function or action of
God. He is the third Person of the Most Holy Trinity. He is the Love breathed
eternally between the Father and the Son. And because love is not something God
has but something God is (1 John 4:8), the Holy Spirit is not simply what
unites the Trinity but who unites the Trinity. He is not the passive
effect of the Father and the Son, but a Person in His own right—possessing the
fullness of divinity, acting with divine authority, and worthy of divine
worship.
The
Thomistic tradition preserves this mystery by maintaining the essential unity
of God’s being while also upholding the real distinction of persons. God is one
substance, one divine being, but He exists as three subsistent
relations. This language may seem technical, but it protects the mystery:
we do not invent explanations out of human categories. Rather, we confess what
has been revealed—what Christ has spoken, what the Spirit has inspired, and
what the Church has handed on with clarity and reverence. In this confession,
we adore not three gods, but one God in three Persons. And in this mystery, we
discover that God is not solitary, but eternally relational: an infinite
communion of love, into which we are drawn by grace.
So when we
ask, “Who is the Holy Spirit?”, the answer is not a what but a who. He
is the Lord, the Giver of Life, the Sanctifier, the Teacher, the Advocate. He
is the divine Person who comes to dwell in the souls of the baptized, making
them temples of God. He is not an impersonal presence but the personal Love of
the Father and the Son, poured into our hearts. And by Him, we cry out “Abba,
Father” (Romans 8:15), because He draws us into the inner life of the Trinity,
where the Love that is God becomes our own life and joy forever.