Yes, God’s essence is
ultimately incomprehensible to us in this life. Yes, the terms like “person,”
“essence,” and “Son” need to be carefully defined. And yes, no one is saved
merely by passing a theological exam on the Trinity. But that does not mean
that the doctrine is irrelevant to salvation.
Let’s begin with the principle: Veritas fidei est de necessariis ad
salutem — “The truth of faith is necessary for salvation.” Now, not every
truth must be explicitly believed by every individual in order to be saved
(e.g., the identity of Melchizedek), but some truths are essential
because they touch the very nature of the one in whom we believe — namely, God
Himself.
Faith, is not mere trust or sincerity. It is a
supernatural habit infused by grace, by which we assent to divinely revealed
truths because God, who is Truth itself, has revealed them. Therefore, the object of saving faith is not merely
the idea of “God in general,” nor even “Jesus as Savior” in an undefined sense
— but the real God as He has revealed Himself to us. The more essential
the truth is to God's identity, the more closely it pertains to the virtue of
faith.
This is why the Trinity matters. God has revealed Himself not merely as a
solitary monad, nor merely as acting through Jesus, but as one God in three
persons: Father, Son, and Holy Spirit. To knowingly reject this is not merely
to reject a theological formulation; it is to reject the very God who has made
Himself known. It is not a question of passing a theological test but of
assenting to God as He is. If one were to say, “I accept God, but not
the God of Abraham, or not the God revealed in Christ,” that would not be true
faith, no matter how sincere.
Now, regarding the claim that there’s “no command” to believe in the
Trinity — this is true only in a very superficial, proof-texting sense. The
Scriptures themselves present the triune reality of God — not in scholastic formulae,
but in revealed form. The Father sends the Son; the Son is begotten, not made;
the Spirit proceeds from the Father and the Son; and all three act with divine
authority, receive divine worship, and share divine glory. The formula of
Matthew 28:19 — baptizing in the name (singular) of the Father, Son, and
Holy Spirit — is a liturgical summary of a deeper metaphysical truth: the unity
of divine essence, and the real distinction of persons.
We must distinguish between what is comprehended
and what is believed. No one can comprehend God’s essence. But to be
saved, one must believe in God as He is — and if He is triune, then faith must
eventually conform to that truth. A person in invincible ignorance who
trusts God sincerely may be saved through implicit faith. But once the Trinity
is clearly proposed and understood, to reject it knowingly is to reject the
true God.
You also raise a valuable point about terms. Indeed, the debate often fails
because the metaphysical terms are undefined or misunderstood. According to the classical theology:
- A “person” is a subsistent relation in an
intellectual nature (Boethius' definition, refined by Aquinas).
- “Essence” refers to what something is — in
God, essence is identical to existence (ipsum esse subsistens).
- “Son” implies origin, not inferiority. In God,
the Son proceeds by generation, not as a creature, but as the
perfect intellectual expression of the Father — the eternal Word.
- “Fully God” means possessing the whole divine
essence, which is simple, indivisible, and not shared by parts.
- “Death” for Christ refers not to the death of His
divine nature, which is impassible, but to the separation of His human
soul from His human body.
When we speak of Jesus as the "Son of God," it’s essential to
recognize that this is not a biological or temporal statement in the same sense
that “son of John” would be. The phrase “Son of God” is not meant to imply a separate and (ontologically) subordinate being who came into existence after the Father, or who is of a
different nature. Rather, in biblical language, especially in the Hebrew
mindset, the term “son of…” often describes identity, nature, or role,
not merely biological descent.
For example:
- "Sons of disobedience" (Ephesians 2:2) does not mean people literally
born from a parent named “Disobedience,” but that they embody
disobedience.
- "Son of perdition" (John 17:12) refers to Judas Iscariot — not
because Perdition is his father, but because his destiny and character
are destruction.
- "Sons of light" (Luke 16:8) describes those who live in and
reflect the truth of God.
- "Son of death" in Hebrew idiom means someone who is destined
to die.
- Barnabas is
called “Son of Encouragement” (Acts 4:36), not because “Encouragement” is
a person, but because that quality defines his nature.
So, when Jesus is called the "Son of God," it does not mean He is
a separate being from God, any more than calling someone a "son of
peace" means they are separate from peace. It means that He shares the
very nature of God — divinity itself.
This is confirmed by John 5:18, where the Jews understood that
Jesus, by calling God His own Father, was making Himself equal with God.
They did not misunderstand Him — Jesus does not correct them. He intensifies
the claim in the verses that follow.
Jehovah's Witnesses, and others like them, make a category mistake: they
assume “Father” and “Son” refer to a relationship of origin in time, and thus
subordinate the Son. But if that logic were consistent, then for Jesus to be
God, He would have to be “His own Father” — an absurdity that reveals the flaw
in their reasoning.
But the relationship between the Father and the Son is eternal and ontological
— it has to do with who God is in Himself, not a temporal event. The
Father is unbegotten, the Son is eternally begotten, and the Spirit proceeds
eternally — this is not mythology or "three gods," but the inner life
of the one true God, as revealed by God Himself.
Furthermore, in Hebrews 1:3, we are told that the Son is the exact
representation (charaktēr) of God’s being (hypostasis) — not merely a
reflection, not a similar image, but the exact imprint. A person who is
“the exact imprint of God's nature” is God.
To summarize:
- "Son of God" in reference to Jesus does not imply lesser
deity, temporal origin, or inferiority.
- In biblical language, "son of" often
denotes nature, destiny, or identity — not physical
lineage.
- Jesus is called God (John 1:1; John 20:28;
Titus 2:13), worshipped as God, exercises the works of God,
and claims the name and authority of God.
- Therefore, calling Jesus the "Son of
God" is a declaration of His divinity, not a denial of it.
You are right that many arguments collapse into proof-text ping-pong. Classical
theology avoids this by carefully analyzing the nature of God, the logical
structure of Scripture, and the principles of metaphysics. The Church did not "invent" the Trinity; only offered a rational and precise explanation of what had already been
revealed and believed. The goal is not to reduce mystery, but to
approach it rightly — with reason obedient to faith.
In sum, the Trinity is not a theological accessory. It is the name of the
true God. To believe in God savingly is to believe in this God — not a
mode, not a creature, not a generic deity. Thus, while invincible ignorance may
excuse, obstinate rejection of the Trinity once clearly understood is not
compatible with saving faith. As Aquinas puts it: "It is impossible to
believe explicitly in the mystery of Christ without faith in the Trinity,
because the mystery of Christ includes the mission of the Son and the giving of
the Holy Spirit." (ST II-II, q.2, a.8)
Therefore, the Trinity is not an arbitrary dogma — it is the deepest reality
of God’s inner life, into which we are invited, by grace, through Christ, in
the Spirit.