I'm sorry. I think I directed you to the wrong post I covered this on an earlier post.
We find two different words used in the NT that are translated as "begotten" in connection to Jesus. The first word we find in John 1:14 which is μονογενοῦς and according to HELPS word studies means "one-and-only" and /génos, "offspring, stock") – properly, one-and-only; "one of a kind" – literally, "one (monos) of a class, genos" (the only of its kind). This establishes the uniqueness of his nature in contrast to that of man.
The other word is γεγέννηκά which we find in Acts 13:33 and Hebrews 1:5.
This word is a metaphor meaning to engender, to cause to rise (resurrection - from ἀνάστασις meaning to stand again).
We find two different words used in the NT that are translated as "begotten" in connection to Jesus. The first word we find in John 1:14 which is μονογενοῦς and according to HELPS word studies means "one-and-only" and /génos, "offspring, stock") – properly, one-and-only; "one of a kind" – literally, "one (monos) of a class, genos" (the only of its kind). This establishes the uniqueness of his nature in contrast to that of man.
The other word is γεγέννηκά which we find in Acts 13:33 and Hebrews 1:5.
This word is a metaphor meaning to engender, to cause to rise (resurrection - from ἀνάστασις meaning to stand again).
In Ac 13:33, "raise up" is used as it is in 13:22 of David, and used in 3:22, 7:37 of Christ as a prophet--elevating a person to occupy a special position in the nation.
In v. 34, where Christ "raised up" from the dead is stressed, it is his resurrection.
Ac 13:33 is speaking of the incarnation, the birth of Christ,
it is vv. 34-35 that are speaking of the resurrection, and γεγέννηκά is not used there.
And in Heb 1:5-6 there are two "comings."
The first coming--incarnation, birth of Christ in v. 5, as shown in Ac 13:33,
and "again" (v.6)--the second coming when God brings the firstborn into the world,
and also where γεγέννηκά is not used in v.6.
So the γεγέννηκά of Ac 13:33 and Heb 1:5 can be shown to be referring to the birth of Christ,
rather than to his resurrection.
So that Ro 1:4 is referring to proof by the power of the resurrection that Jesus is the Son of God.
He is the first one of a now order of creatures - sons of God.
that "Son of God" is the first of a whole race.