Jesus, The Son of God

and was declared to be the Son of God in power according to the Spirit of holiness by his resurrection from the dead, Jesus Christ our Lord,

Romans 1:4 ESV

Jesus was declared to be or designated as or shown to be the Son of God by His resurrection from the dead. I wonder if this language is the description of a happening or simply an evidence or affirmation. To me it reads as a proof. It confirms what was already known or stated by Jesus, that He is indeed the Son of God.

The reason I even ponder or review this distinction is because for the last year or so I've wondered what it means when it says in the book of Hebrews (quoting the Old Testament):

You are my Son, today I have begotten you

I will be to him a father, and he shall be to me a son

Hebrews 1:5
Psalm 2:7
2 Samuel 7:14

The Messianic passages in the Old Testament often baffle me because they have a historical meaning in their original context in addition to their prophetic quality, referring to the Messiah.

In this case it sounds as if Jesus becomes the Son at a given point in time - human history. It is important to point out the perfect clarity that Jesus always was. He was not created, nor did He come into being.

In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through him, and without him was not any thing made that was made. In him was life, and the life was the light of men.

And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.

John 1:1-14,14 ESV

My question is not concerned with Jesus' eternal existence or equality with God. Hebrews 1 makes me wonder if "The Word" was always referred to as "the Son" or if the title and position became His when He was born into this world. Certainly His name "Jesus" or "Yeshua" and His becoming a son of David were not always so from eternity (though the knowledge and plan of such always existed in the mind and heart of God).

Romans 1:4 speaks of yet another "Sonship" or "bornness". When Jesus, by the power of the Spirit of holiness (an "indestructible life"!!!!!!!) raised from the grave, He became the firstborn from the dead... with many brethren to follow.

And what we have said is even more clear if another priest like Melchizedek appears, one who has become a priest not on the basis of a regulation as to his ancestry but on the basis of the power of an indestructible life. For it is declared:

"You are a priest forever,
in the order of Melchizedek."

Hebrews 7:15-17 NIV