What is the Main Message of Hebrews?

I am about to work through Hebrews with my Greek Exegesis class, so I am reminded of a discovery I made in Hebrews a few years ago. I am happy to follow up my post of a couple of days ago with some fresh ideas.
Recently I have discovered two effective ways in which Auctor (Latin for author of the Letter to the Hebrews) exhorts us to recognize the main theme in his book—Jesus. First, twice he calls particular attention to the One who is the real answer to his readers’ problems—Jesus. In 3:1 he writes: “Holy brothers, partakers of a heavenly calling, fix your thoughts on the Apostle and High Priest of our confession, JESUS.” And in 12:2 he writes, “Fixing our eyes on the Author and Finisher of our faith, JESUS.” These two statements, each from one of the two main sections of the book (1:1-10:18 and 10:19-13:25) are strikingly parallel in their structure.
Fix your thoughts on the Apostle and High Priest of our confession Jesus
κατανοήσατε τὸν ἀπόστολον καὶ ἀρχιερέα τῆς ὁμολογίας ἡμῶν Ἰησοῦν
Fix our eyes on the Author and Finisher of our faith Jesus
ἀφορῶντες εἰς τὸν ἀρχηγὸν καὶ τελειωτὴν τῆς πίστεως Ἰησοῦν

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