What does the epistle to the Hebrews mean when it calls Jesus "Son"?

Is "Son" a title that denotes his eternal existence as one person of the Trinity? Or is it a title Jesus receives upon his installation on heaven's throne after his resurrection and ascension?

In this Studies in Christian Doctrine and Scripture (SCDS) volume, which promotes fresh understandings of Christian belief through creative, faithful readings of the canonical text, pastor and New Testament scholar R. B. Jamieson probes the complexity of the Christology presented in the epistle to the Hebrews.

Exploring the paradox of this key term, Jamieson argues that, according to Hebrews, "Son" names both who Jesus is eternally and what he becomes at the climax of his incarnate, saving mission. Jesus is, in short, the eternal Son who became the messianic Son for us and for our salvation. This volume thereby offers a case study showing how the church's core convictions about Christ lead us not away from the text, but deeper into it.