Eternal Sonship and the Meaning of Only Begotten

The struggle here is between the way we use words like "son" and "begotten" in ordinary human experience and the way Scripture uses those words of Christ, particularly in the phrase "only begotten son" in John 3:16,18. If we read the text with our normal, strictly biological categories, it appears to say: there was a time when the Son did not exist, and then He came into existence. Yet the wider testimony of Scripture insists on the preexistence of the Son and His full participation in the eternal Godhead.

To resolve this, we have to do two things: let Scripture interpret Scripture, and pay close attention to how particular words are actually used in the biblical text, rather than importing our everyday usage as the decisive meaning.

The Term "Only Begotten" in Scripture

In John 3:16,18, the key word is the Greek monogen=es, usually rendered "only begotten." It is used of Christ several times (John 1:14,18; John 3:16,18; 1 John 4:9), but it is also used in Hebrews 11:17 of Isaac:

"By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son."

Here is an important observation: Isaac was not Abraham's only son in the simple, biological sense. Abraham had Ishmael, and later sons by Keturah. Yet Hebrews calls Isaac the monogen=es. This immediately shows that the word cannot be restricted to “the only child who came into existence at such-and-such a time.” It clearly carries a nuance of uniqueness, special status, and relation to the promise.

That means we cannot simply lift our everyday meaning of "only begotten" (as if it always meant “the one and only child who began to exist at a particular moment”) and declare that to be the definitive meaning when applied to Christ. Scripture itself uses the word with more nuance. With Isaac, the emphasis is on the unique, promised heir, not on his being the only biological offspring.

When John 1:14 says, "we beheld his glory, the glory as of the only begotten of the Father," the emphasis is on the Son’s unique relationship to the Father and His unique glory, not merely on a point of origin.

Preexistence and Incarnation

The New Testament is clear that the One we call "Jesus" did not begin to exist at Bethlehem. There is a preexistent second person of the Godhead, who later is "made of a woman, made under the law" Galatians 4:4.

"But when the fullness of the time was come, God sent forth his Son, made of a woman, made under the law."

Notice what is not said. The verse does not say, "God brought a Son into existence." It says, "God sent forth his Son," and this Son was "made of a woman, made under the law." There is a clear sequence: the Son exists, and then at the fullness of time He is sent and is made of a woman, under the law. That is the incarnation, not the beginning of His existence.

You could paraphrase the sense this way: at a particular moment, the preexistent Son is placed into a new condition—conceived in a woman, subject to the Mosaic law. That is a historical beginning of His incarnate life, but not a beginning of His person.

Likewise, the annunciation language in the Gospels ties the title "Son of God" to the conception by the Holy Spirit and the birth from Mary. It is at that point that He begins to be called "Son" in the incarnate, messianic sense. Prior to that, the second person of the Godhead exists, but is not yet "made of a woman, made under the law."

So we can say:

• The second person of the Godhead is eternal and without beginning.
• At the incarnation, this eternal person is "made of a woman, made under the law" and, in that incarnate role, is manifested and designated as the "Son" and "only begotten."

Sonship and Beginning

Does "son" always imply a beginning? In human experience, yes: every son has a point at which he did not exist and then began to exist. But our human analogy is limited. The Bible uses relational and familial language to speak of God, and we must allow for the fact that when such language is applied to the eternal Godhead, some aspects are analogical rather than strictly biological.

If we insisted that "son" must always mean "one who began to exist after his father," then we would either:

• deny the eternal preexistence of the Son altogether, or
• deny that "Son" is a true description of the second person of the Godhead.

Most nontrinitarian systems resolve the tension by denying the eternal preexistence of the Son or by reinterpreting "Son" and "only begotten" in a purely metaphorical or purely created-angel sense. But that conflicts with multiple strands of Scripture: Christ as the agent of creation, His identification with the "I am," and His glory as the Father's unique one.

Begotten and the Incarnation

In light of Galatians 4:4 and the birth narratives, it is most coherent to see "only begotten Son of God" as language that comes into play at the incarnation. There is a real, historical beginning of His human life: conceived by the Holy Spirit, born of the virgin, placed under the law. At that moment, the eternal person who already exists takes on a new mode of existence—true humanity—and thus becomes, in history, the "only begotten Son."

In that sense:

• "Begotten" rightly marks a beginning of His incarnate life.
• It does not mark the beginning of His existence as the second person of the Godhead.

The phrase "eternally begotten," when used in theological tradition, attempts to protect the truth that the Father and the Son stand in an eternal relation of Father and Son, without implying that the Son had a temporal beginning. But the biblical data itself leads us at least this far: the eternal person becomes, in time, the incarnate Son, and is then called the "only begotten Son of God."

Putting It Together

We can now address the core of your question:

• Can you be begotten and not have a beginning? If we are talking about the incarnation, there is indeed a beginning: the Son is conceived, born, and enters into human history. He is begotten in that historical, incarnate sense.
• Does that require a beginning of His existence as the Son in relation to the Father? No. The wider Scriptural teaching on His preexistence and role in creation prevents us from reading "only begotten" as implying that the second person of the Godhead once did not exist and then came into existence.

So we distinguish:

1. The eternal existence of the second person of the Godhead, who is truly in filial relation to the Father.
2. The temporal beginning of His incarnate life, when He is conceived by the Holy Spirit and born of Mary, at which point He is called the "only begotten Son of God" in history.

In this way, we take seriously both the language of "only begotten Son" and the many passages that testify to His preexistence, without forcing the human pattern of father–son beginnings directly onto the eternal life of God.

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