First, read all of Hb 1:1-14.
Quick answer: Two Natures = God-Man
From the foregoing we can see that [Hb 1:1-14] is speaking of Jesus:
- Before his Incarnation as the Agent of Creation. [He is God -> Son of God]
- During his Incarnation when he became the Redeemer. [He is fully God and fully Man (hypostatic union)]
- After his resurrection + exaltation into glory where he then began ruling on the Divine throne forever. [He is the Resurrected God-Man]
In other words, the entire chapter is a reflection on Jesus’ existence before he became a man, when he became a man, + after his resurrection + ascension into heaven.
In light of the preceding, it is quite evident that the author of Hebrews was commenting on the whole Christ event, that he was looking at Jesus’ entire career retrospectively. The author wasn’t focusing so much on the natures of Christ, i.e. did Christ have one or two natures, was he God + man simultaneously etc., but on the various functions that he performed. The writer was speaking of the one eternal Person of Jesus from all his various activities, from his role as Creator, Sustainer, Redeemer, + eternal King.
We need to realize is that Hb 1:8-9 is quoting Ps 45:6-7, which is a Psalm composed in relation to the Davidic King’s wedding ceremony. [READ] Ps 45:1-17
The author of Hebrews applied this text in reference to Jesus’ Messianic office, an office which he received by virtue of becoming a human descendant of king David after the Incarnation: Lk 1:30-33; Rom 1:3-4
Putting it in another way, the writer applied Ps 45:6-7 to Jesus in reference to his Messianic role, that as the Son of David he perfectly fulfills all the promises God made to David + his sons that theirs would be an eternal royal dynasty: 2 Sa 7:10-15
As a side note, 2 Sa 7:14 is applied to Jesus in Hb 1:5!
But since the only way Jesus could have ever fulfilled these promises is by becoming a man from the line of David this implies that Hb 1:8-9 has Jesus’ Incarnation and exaltation in view. After all, if Jesus hadn’t taken on a human nature he would not have become a descendant of David + could not therefore rule on the throne as his representative.
⬇️⬇️⬇️ CONTINUED ⬇️⬇️⬇️